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Unity android build Giving Build Method Exception

When i build the game unity says eror in console and then crashes, this all began when i tried to ad ads to the game, previuosly it built with no problem i have reinstalled different unity versions multiple times but the same error seems to occur:
THis is the same error i get Just before a Dilogue box This one--> Saying 1 exception was raised by workers:See the Console for details
`
`UnityEditor.BuildPlayerWindow+BuildMethodException: 4 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002da] in <434908727417408abd02bbd1a0835ef8>:0
at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <434908727417408abd02bbd1a0835ef8>:0
0x00007ff748d7826d (Unity) StackWalker::GetCurrentCallstack
0x00007ff748d7ee29 (Unity) StackWalker::ShowCallstack
0x00007ff749d02cc3 (Unity) GetStacktrace
0x00007ff74a3a3ebd (Unity) DebugStringToFile
0x00007ff747e3f392 (Unity) DebugLogHandler_CUSTOM_Internal_Log
0x0000024b0d4efae3 (Mono JIT Code) (wrapper managed-to-native) UnityEngine.DebugLogHandler:Internal_Log (UnityEngine.LogType,UnityEngine.LogOption,string,UnityEngine.Object)
0x0000024b0d4ef9fb (Mono JIT Code) UnityEngine.DebugLogHandler:LogFormat (UnityEngine.LogType,UnityEngine.Object,string,object[])
0x0000024b0d4ef740 (Mono JIT Code) UnityEngine.Logger:Log (UnityEngine.LogType,object)
0x0000024b35209005 (Mono JIT Code) UnityEngine.Debug:LogError (object)
0x0000024b3214e4cb (Mono JIT Code) UnityEditor.BuildPlayerWindow:CallBuildMethods (bool,UnityEditor.BuildOptions)
0x0000024b35093e23 (Mono JIT Code) UnityEditor.BuildPlayerWindow:GUIBuildButtons (UnityEditor.Modules.IBuildWindowExtension,bool,bool,bool,UnityEditor.Build.BuildPlatform,UnityEditor.Modules.IBuildPostprocessor)
0x0000024b35083d43 (Mono JIT Code) UnityEditor.BuildPlayerWindow:ShowBuildTargetSettings ()
0x0000024b350739a3 (Mono JIT Code) UnityEditor.BuildPlayerWindow:OnGUI ()
0x0000024b0c43f36a (Mono JIT Code) UnityEditor.HostView:InvokeOnGUI (UnityEngine.Rect)
0x0000024b0c43f183 (Mono JIT Code) UnityEditor.DockArea:DrawView (UnityEngine.Rect)
0x0000024b0c430afb (Mono JIT Code) UnityEditor.DockArea:OldOnGUI ()
0x0000024b0b95d697 (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:DoOnGUI (UnityEngine.Event,UnityEngine.Matrix4x4,UnityEngine.Rect,bool,UnityEngine.Rect,System.Action,bool)
0x0000024b0c42e1bb (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleIMGUIEvent (UnityEngine.Event,UnityEngine.Matrix4x4,UnityEngine.Rect,System.Action,bool)
0x0000024b0d82a59b (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleIMGUIEvent (UnityEngine.Event,System.Action,bool)
0x0000024b0d82a403 (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleIMGUIEvent (UnityEngine.Event,bool)
0x0000024b0d829f4b (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase,bool,bool)
0x0000024b0d829e03 (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:SendEventToIMGUI (UnityEngine.UIElements.EventBase,bool,bool)
0x0000024ac551b21b (Mono JIT Code) UnityEngine.UIElements.IMGUIContainer:HandleEvent (UnityEngine.UIElements.EventBase)
0x0000024ac5502ae8 (Mono JIT Code) UnityEngine.UIElements.CallbackEventHandler:HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase)
0x0000024b0d827273 (Mono JIT Code) UnityEngine.UIElements.MouseCaptureDispatchingStrategy:DispatchEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel)
0x0000024ac5500cfe (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel,bool)
0x0000024ac55007fb (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:ProcessEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel)
0x0000024ac550725b (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:ProcessEventQueue ()
0x0000024ac55056e3 (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:OpenGate ()
0x0000024ac550561b (Mono JIT Code) UnityEngine.UIElements.EventDispatcherGate:Dispose ()
0x0000024ac5500a83 (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:ProcessEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel)
0x0000024ac5500133 (Mono JIT Code) UnityEngine.UIElements.EventDispatcher:Dispatch (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.IPanel,UnityEngine.UIElements.DispatchMode)
0x00000248791bffcb (Mono JIT Code) UnityEngine.UIElements.BaseVisualElementPanel:SendEvent (UnityEngine.UIElements.EventBase,UnityEngine.UIElements.DispatchMode)
0x0000024ac42a0fa3 (Mono JIT Code) UnityEngine.UIElements.UIElementsUtility:DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel)
0x0000024ac42a0993 (Mono JIT Code) UnityEngine.UIElements.UIElementsUtility:UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (int,intptr,bool&)
0x0000024ac42a074f (Mono JIT Code) UnityEngine.UIElements.UIEventRegistration:ProcessEvent (int,intptr)
0x0000024ac42a066b (Mono JIT Code) UnityEngine.UIElements.UIEventRegistration/<>c:<.cctor>b__1_2 (int,intptr)
0x0000024ac42a04bd (Mono JIT Code) UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
0x0000024ac42a0576 (Mono JIT Code) (wrapper runtime-invoke) <Module>:runtime_invoke_void_int_intptr_intptr& (object,intptr,intptr,intptr)
0x00007fffdc77feb4 (mono-2.0-bdwgc) [mini-runtime.c:3445] mono_jit_runtime_invoke
0x00007fffdc6be764 (mono-2.0-bdwgc) [object.c:3066] do_runtime_invoke
0x00007fffdc6be8fc (mono-2.0-bdwgc) [object.c:3113] mono_runtime_invoke
0x00007ff748c9cc34 (Unity) scripting_method_invoke
0x00007ff748c7c4d4 (Unity) ScriptingInvocation::Invoke
0x00007ff748c770e5 (Unity) ScriptingInvocation::Invoke<void>
0x00007ff748dc12ca (Unity) Scripting::UnityEngine::GUIUtilityProxy::ProcessEvent
0x00007ff7497e2b28 (Unity) GUIView::ProcessRetainedMode
0x00007ff749d334b1 (Unity) GUIView::OnInputEvent
0x00007ff7497e293a (Unity) GUIView::ProcessInputEvent
0x00007ff749d342cd (Unity) GUIView::ProcessEventMessages
0x00007ff749d2e019 (Unity) GUIView::GUIViewWndProc
0x00007ff84110e7e8 (USER32) CallWindowProcW
0x00007ff84110e229 (USER32) DispatchMessageW
0x00007ff749d08ce3 (Unity) MainMessageLoop
0x00007ff749d0d72b (Unity) WinMain
0x00007ff74b0c224e (Unity) __scrt_common_main_seh
0x00007ff8405c7614 (KERNEL32) BaseThreadInitThunk
0x00007ff8424226a1 (ntdll) RtlUserThreadStart`
`
I tried to build an android game with ads and it kept crashing

Getting a build error in Unity3d when building a VR project

I am trying to build a sample project which can be found at this link https://www.coursera.org/learn/xr-introduction/supplement/cARor/project-work-build-a-vr-application-to-your-device and I am getting this error:
Build completed with a result of 'Failed'
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()
UnityEditor.BuildPlayerWindow+BuildMethodException: 4 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x00242] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:194
at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x0007f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:97
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()
What to do?

Try to build in a different location? Preferably outside your project folder.

The "ConvertResourcesCases" task failed unexpectedly. Xamarin Android build

When I build my Xamarin Android app with Visual Studio 2017 for Mac(7.7.4 build 1), Mono JIT compiler version 5.18.0.248 (2018-08/a4956c837e1 Fri Jan 25 16:13:12 EST 2019) I get the following exceptions:
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: The "ConvertResourcesCases" task failed unexpectedly.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: System.IO.IOException: Could not create file "/Users/username/Companymobil/src/Company.Recipes.Droid/obj/Debug/lp/35/jl/res/values-ca/values-ca.xml" or "/var/folders/b5/821mhz8n0px17rnxglrjq5mc0000gp/T/tmp565e9644.tmp". File already exists.
/var/folders/b5/821mhz8n0px17rnxglrjq5mc0000gp/T/
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at System.IO.File.Copy (System.String sourceFileName, System.String destFileName, System.Boolean overwrite) [0x00193] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/File.cs:111
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (Microsoft.Build.Framework.ITaskItem item, System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x00204] in <78f051a6e2064f849cc3ee585300af39>:0
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x0000f] in <78f051a6e2064f849cc3ee585300af39>:0
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Xamarin.Android.Tasks.ConvertResourcesCases.Execute () [0x000a7] in <78f051a6e2064f849cc3ee585300af39>:0
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:573
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x001f6] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:784
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: The "ConvertResourcesCases" task failed unexpectedly.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: System.IO.IOException: Could not create file "/Users/username/Companymobil/src/Company.ServerAnnouncement.Droid/obj/Debug/lp/15/jl/res/layout/notification_template_icon_group.xml" or "/var/folders/b5/821mhz8n0px17rnxglrjq5mc0000gp/T/tmp4d4475a7.tmp". File already exists.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at System.IO.File.Copy (System.String sourceFileName, System.String destFileName, System.Boolean overwrite) [0x00193] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.IO/File.cs:111
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (Microsoft.Build.Framework.ITaskItem item, System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x00204] in <78f051a6e2064f849cc3ee585300af39>:0
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Xamarin.Android.Tasks.ConvertResourcesCases.FixupResources (System.Collections.Generic.Dictionary`2[TKey,TValue] acwMap) [0x0000f] in <78f051a6e2064f849cc3ee585300af39>:0
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Xamarin.Android.Tasks.ConvertResourcesCases.Execute () [0x000a7] in <78f051a6e2064f849cc3ee585300af39>:0
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [0x00023] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/TaskExecutionHost/TaskExecutionHost.cs:573
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(1689,2): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask (Microsoft.Build.BackEnd.ITaskExecutionHost taskExecutionHost, Microsoft.Build.BackEnd.Logging.TaskLoggingContext taskLoggingContext, Microsoft.Build.BackEnd.TaskHost taskHost, Microsoft.Build.BackEnd.ItemBucket bucket, Microsoft.Build.BackEnd.TaskExecutionMode howToExecuteTask) [0x001f6] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-08/external/bockbuild/builds/msbuild-15/src/Build/BackEnd/Components/RequestBuilder/TaskBuilder.cs:784
If I click on Build (NOT Rebuild) those exceptions get less every time I build until it finally builds successfully.
If I use jetbrains Rider, the build works every single time.
I gave full permissions (r/w) to everyone on the directories mentioned in the exception and I still get the error. I use APFS case-insensitive.
I would be very grateful for any pointer to solve this.

Thank you very much Leon Lu from Microsoft for pointing me in the right direction. The error stems from a condition in parallel building xamarin android. When parallel builds are disabled, the outcome is the same each time. Parallel builds can be disabled in the Preferences of Visual Studio 2017 for Mac (see attached image).
The issue seems to be fixed (see GitHub link in Leon Lu's comment) and be rolling out in one of the future updates.

Fail to use Maven to build Paho project on Win7

I've tried to create an MQTT project on Android by using PAHO.
According to the description, I clone the source code to my computer, and using
mvn clean install
to build the project.
I download org.eclipse.paho.mqtt.java-1.0.0, and expecting to get:
org.eclipse.paho.client.mqttv3-1.0.0.jar and
org.eclipse.paho.android.service-1.0.0.jar
but after running mvn clean install, I just can get org.eclipse.paho.client.mqttv3-1.0.0.jar, so I can't build the project.
and here is the message output:
C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.and roid.service>mvn install -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model fororg.eclipse.paho:android-service:jar:0.1
[WARNING] 'version' contains an expression but should be a constant. # org.eclipse.paho:java-parent:${paho.version}, C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\pom.xml, line 7, column 11
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-jar-plugin is missing. # line 95, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building android-service 0.1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- templating-maven-plugin:1.0-alpha-3:filter-sources (filter-src) # android-service ---
[INFO] Request to add 'C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.android.service\src\main\java-templates' folder. Not added since it does not exist.
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) # android-service ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.android.service\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:2.3:compile (default-compile) # android-service ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-bundle-plugin:2.3.7:manifest (generate-manifest) # android-service ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.910 s
[INFO] Finished at: 2015-01-15T13:16:59+08:00
[INFO] Final Memory: 13M/153M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.felix:maven-bundle-plugin:2.3.7:manifest (generate-manifest) on project android-service: Cannot find C:\Users\Janniin\
Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.android.service\target\classes (manifest goal must be run after compile phase) -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.felix:maven-bundle-plugin:2.3.7:manifest (generate-manifest) on projec
t android-service: Cannot find C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.android.service\target\classes (manifest goal must b
e run after compile phase)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:355)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:216)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:160)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Cannot find C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.android.service\target\classes (manifest goal must be run after compile phase)
at org.apache.felix.bundleplugin.ManifestPlugin.execute(ManifestPlugin.java:73)
at org.apache.felix.bundleplugin.BundlePlugin.execute(BundlePlugin.java:264)
at org.apache.felix.bundleplugin.BundlePlugin.execute(BundlePlugin.java:255)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
... 19 more
Caused by: java.io.FileNotFoundException: C:\Users\Janniin\Downloads\org.eclipse.paho.mqtt.java-1.0.0\org.eclipse.paho.android.service\target\classes
at org.apache.felix.bundleplugin.ManifestPlugin.getAnalyzer(ManifestPlugin.java:175)
at org.apache.felix.bundleplugin.ManifestPlugin.getManifest(ManifestPlugin.java:114)
at org.apache.felix.bundleplugin.ManifestPlugin.execute(ManifestPlugin.java:69)
... 23 more
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
Could anyone give me some suggest to solve this problem??
Thx a lot!!

Have you tried following the information described here https://eclipse.org/paho/clients/java/ in order to build from source.
After running mvn package -DskipTests (it took some time) I got:
org.eclipse.paho.android.service-1.0.1.jar which is located under ..\org.eclipse.paho.mqtt.java\org.eclipse.paho.android.service\org.eclipse.paho.android.service\target
org.eclipse.paho.client.mqttv3-1.0.1.jar which is located under ..\org.eclipse.paho.mqtt.java\org.eclipse.paho.client.mqttv3\target

Monodroid will not deploy when using an ImageView

I have this in my Main.axml;
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
>
<Button
android:id="#+id/MyButton"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="#string/Hello"/>
<ImageView
android:src="#drawable/samplebackground"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/MyButton"/>
</RelativeLayout>
It builds fine and sampleBackground is a jpg that has been included in my project.
However when I try to deploy I get an error;
Object reference not set to an instance of an object
And there are a bunch of lines stating <filename unknown>
If I remove the ImageView from the markup the application deploys fine.
Any thoughts?
full stack
------ Build started: Project: MonoAndroidApplication1, Configuration: Debug Any CPU ------
MonoAndroidApplication1 -> C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\bin\Debug\MonoAndroidApplication1.dll
Microsoft (R) Build Engine Version 4.0.30319.1
[Microsoft .NET Framework, Version 4.0.30319.225]
Copyright (C) Microsoft Corporation 2007. All rights reserved.
Build started 8/06/2011 8:37:40 AM.
Project "C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\MonoAndroidApplication1.csproj" on node 1 (SignAndroidPackage target(s)).
_GenerateAndroidAssetsDir:
Skipping target "_GenerateAndroidAssetsDir" because it has no outputs.
_ResolveMonoAndroidSdks:
Looking for Android SDK..
Key HKCU\SOFTWARE\Android SDK Tools\Path not found.
Key HKLM\SOFTWARE\Android SDK Tools\Path found:
Path contains adb.exe in \platform-tools (C:\Program Files\Android\android-sdk).
Looking for Java SDK..
Key HKLM\SOFTWARE\JavaSoft\Java Development Kit\CurrentVersion found: 1.6.
Key HKLM\SOFTWARE\JavaSoft\Java Development Kit\1.6\JavaHome found:
Path contains jarsigner.exe in \bin (C:\Program Files\Java\jdk1.6.0_25).
MonoAndroid Tools: C:\Program Files\MSBuild\Novell\
MonoAndroid Framework: C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v2.2\;C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\
Android SDK: C:\Program Files\Android\android-sdk\
Java SDK: C:\Program Files\Java\jdk1.6.0_25\
_ValidateAndroidPackageProperties:
GetAndroidPackageName Task
ManifestFile:
AssemblyName: MonoAndroidApplication1
PackageName: MonoAndroidApplication1.MonoAndroidApplication1
_UpdateAndroidResgen:
Skipping target "_UpdateAndroidResgen" because all output files are up-to-date with respect to the input files.
GenerateTargetFrameworkMonikerAttribute:
Skipping target "GenerateTargetFrameworkMonikerAttribute" because all output files are up-to-date with respect to the input files.
CoreCompile:
Skipping target "CoreCompile" because all output files are up-to-date with respect to the input files.
_CopyOutOfDateSourceItemsToOutputDirectoryAlways:
Copying file from "C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\Resources\Drawable-land\Icon.png" to "bin\Debug\Resources\Drawable-land\Icon.png".
CopyFilesToOutputDirectory:
MonoAndroidApplication1 -> C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\bin\Debug\MonoAndroidApplication1.dll
ContractDeclarativeAssemblyCS:
Skipping target "ContractDeclarativeAssemblyCS" because all output files are up-to-date with respect to the input files.
_ConvertDebuggingFiles:
Skipping target "_ConvertDebuggingFiles" because all output files are up-to-date with respect to the input files.
_CompileAndroidPackage:
Mandroid Task
Assemblies: C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\bin\Debug\MonoAndroidApplication1.dll; C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v2.2\Mono.Android.dll; C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\mscorlib.dll; C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Core.dll; C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.dll; C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Xml.dll; C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Xml.Linq.dll
I18nAssemblies:
BuildDirectory: C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\obj\Debug\
ReferenceAssembliesDirectory: C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v2.2\;C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\;;
AndroidSdkDirectory: C:\Program Files\Android\android-sdk\
JavaSdkDirectory: C:\Program Files\Java\jdk1.6.0_25\
AssetDirectory: C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\obj\Debug\assets\
AndroidSdkPlatform: 8
MonoAndroidToolsDirectory: C:\Program Files\MSBuild\Novell\
ResourceDirectory: C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\obj\Debug\res\
ManifestTemplate:
Package: MonoAndroidApplication1.MonoAndroidApplication1
NativeLibrary:
JavaSource:
Debug: True
UseSharedRuntime: True
SupportedAbis: armeabi
LinkMode: None
ExtraArgs:
C:\Program Files\MSBuild\Novell\mandroid.exe -v --nosign --sdk-dir="C:\Program Files\Android\android-sdk" --builddir="C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\obj\Debug\android" --framework-dir="C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v2.2" --framework-dir="C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0" -S="C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\obj\Debug\res" --package="MonoAndroidApplication1.MonoAndroidApplication1" --nolink --abi="armeabi" --java-sdk-dir="C:\Program Files\Java\jdk1.6.0_25" --debug --sdk-platform="8" -A="C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\obj\Debug\assets" "C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\bin\Debug\MonoAndroidApplication1.dll" "C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v2.2\Mono.Android.dll" "C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\mscorlib.dll" "C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Core.dll" "C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.dll" "C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Xml.dll" "C:\Program Files\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\System.Xml.Linq.dll"
monodroid : error 1: System.NullReferenceException: Object reference not set to an instance of an object [C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\MonoAndroidApplication1.csproj]
at MonoDroid.Utils.ProcessRocks+c__Iterator5.MoveNext () [0x00000] in :0
at Monodroid.Toolbox.InvokeCommand (IEnumerable1 commandLine) [0x00000] in <filename unknown>:0
at Monodroid.Toolbox.InvokeAapt (System.String packageName) [0x00000] in <filename unknown>:0
at Monodroid.Droidinator.CreatePackagedResources (System.Collections.Generic.List1 javaTypes) [0x00000] in :0
at Monodroid.Droidinator.CreateApk () [0x00000] in :0
at Monodroid.MainClass.Main (System.String[] argv) [0x00000] in :0
Done Building Project "C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\MonoAndroidApplication1.csproj" (SignAndroidPackage target(s)) -- FAILED.
Build FAILED.
"C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\MonoAndroidApplication1.csproj" (SignAndroidPackage target) (1) ->
(_CompileAndroidPackage target) ->
monodroid : error 1: System.NullReferenceException: Object reference not set to an instance of an object [C:\Development\MonoAndroidApplication1\MonoAndroidApplication1\MonoAndroidApplication1.csproj]

EDIT:
I found the solution; just make sure the image filename is in lowercase.
My image was named Image.png by renaming it to image.png it worked.
It's easy enough to reproduce - just create a new solution with a layout with a ImageView. Set the android:src="#drawable/Image".
If I type the Image with lowercase, image, it gives a compiler error, but when i correct it to Image no compile time errors, but the packaging fails...
The Image is in the correct folder and set to AnddroidResource.
So I would indeed like some help on this one too.
Thanks, Nicklas

Make sure that the Build Action for that image file is set to AndroidResource. You can set the Build Action by right clicking on the file in Visual Studio and selecting Properties.