Develop Reference

Android IDE error - AlreadyDisposedException while opening Android studio

I have Android studio dolphin version.
While I try to open Android studio, an error dialog box appears and it shows like
IDE error occured
See details and submit report
And the report shows an error as below
com.intellij.serviceContainer.AlreadyDisposedException: Already disposed: Module: 'AppName.app' (disposed)
at com.intellij.serviceContainer.ComponentManagerImpl.checkState(ComponentManagerImpl.kt:184)
at com.intellij.serviceContainer.ComponentManagerImpl.getComponent(ComponentManagerImpl.kt:533)
at com.intellij.facet.FacetManager.getInstance(FacetManager.java:15)
at com.intellij.facet.impl.ProjectFacetManagerImpl.getIndex(ProjectFacetManagerImpl.java:76)
at com.intellij.facet.impl.ProjectFacetManagerImpl.hasFacets(ProjectFacetManagerImpl.java:100)
at com.intellij.facet.impl.ui.FacetDependentToolWindowManager$1.facetRemoved(FacetDependentToolWindowManager.java:58)
at com.intellij.facet.impl.ProjectWideFacetListenersRegistryImpl$ProjectWideFacetListenerWrapper.facetRemoved(ProjectWideFacetListenersRegistryImpl.java:86)
at com.intellij.facet.impl.FacetEventsPublisher.onFacetRemoved(FacetEventsPublisher.kt:129)
at com.intellij.facet.impl.FacetEventsPublisher.onModuleRemoved(FacetEventsPublisher.kt:89)
at com.intellij.facet.impl.FacetEventsPublisher.access$onModuleRemoved(FacetEventsPublisher.kt:17)
at com.intellij.facet.impl.FacetEventsPublisher$1.moduleRemoved(FacetEventsPublisher.kt:29)
at com.intellij.util.messages.impl.MessageBusImpl.invokeMethod(MessageBusImpl.java:645)
at com.intellij.util.messages.impl.MessageBusImpl.invokeListener(MessageBusImpl.java:624)
at com.intellij.util.messages.impl.MessageBusImpl.deliverMessage(MessageBusImpl.java:417)
at com.intellij.util.messages.impl.MessageBusImpl.pumpWaitingBuses(MessageBusImpl.java:390)
at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:372)
at com.intellij.util.messages.impl.MessageBusImpl.access$200(MessageBusImpl.java:33)
at com.intellij.util.messages.impl.MessageBusImpl$MessagePublisher.invoke(MessageBusImpl.java:179)
at com.sun.proxy.$Proxy87.moduleRemoved(Unknown Source)
at com.intellij.workspaceModel.ide.impl.legacyBridge.module.ModuleManagerBridgeImpl.fireEventAndDisposeModule(ModuleManagerBridgeImpl.kt:63)
at com.intellij.workspaceModel.ide.impl.legacyBridge.module.ModuleManagerComponentBridge.processModuleChange(ModuleManagerComponentBridge.kt:181)
at com.intellij.workspaceModel.ide.impl.legacyBridge.module.ModuleManagerComponentBridge.access$processModuleChange(ModuleManagerComponentBridge.kt:45)
at com.intellij.workspaceModel.ide.impl.legacyBridge.module.ModuleManagerComponentBridge$2$changed$1.invoke(ModuleManagerComponentBridge.kt:126)
at com.intellij.workspaceModel.ide.impl.legacyBridge.module.ModuleManagerComponentBridge$2$changed$1.invoke(ModuleManagerComponentBridge.kt:74)
at com.intellij.workspaceModel.ide.impl.UtilsKt.executeOrQueueOnDispatchThread(utils.kt:13)
at com.intellij.workspaceModel.ide.impl.legacyBridge.module.ModuleManagerComponentBridge$2.changed(ModuleManagerComponentBridge.kt:102)
at com.intellij.workspaceModel.ide.WorkspaceModelTopics$EventsDispatcher.changed(WorkspaceModelTopics.kt:118)
at com.intellij.util.messages.impl.MessageBusImpl.invokeMethod(MessageBusImpl.java:645)
at com.intellij.util.messages.impl.MessageBusImpl.invokeListener(MessageBusImpl.java:624)
at com.intellij.util.messages.impl.MessageBusImpl.deliverMessage(MessageBusImpl.java:417)
at com.intellij.util.messages.impl.MessageBusImpl.pumpWaitingBuses(MessageBusImpl.java:390)
at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:372)
at com.intellij.util.messages.impl.MessageBusImpl.access$200(MessageBusImpl.java:33)
at com.intellij.util.messages.impl.MessageBusImpl$MessagePublisher.invoke(MessageBusImpl.java:179)
at com.sun.proxy.$Proxy96.changed(Unknown Source)
at com.intellij.workspaceModel.ide.impl.WorkspaceModelImpl.onChanged(WorkspaceModelImpl.kt:112)
at com.intellij.workspaceModel.ide.impl.WorkspaceModelImpl.access$onChanged(WorkspaceModelImpl.kt:19)
at com.intellij.workspaceModel.ide.impl.WorkspaceModelImpl$updateProjectModel$2.invoke(WorkspaceModelImpl.kt:75)
at com.intellij.workspaceModel.ide.impl.WorkspaceModelImpl$updateProjectModel$2.invoke(WorkspaceModelImpl.kt:19)
at com.intellij.workspaceModel.storage.impl.VersionedEntityStorageImpl.replace(VersionedEntityStorageImpl.kt:183)
at com.intellij.workspaceModel.ide.impl.WorkspaceModelImpl.updateProjectModel(WorkspaceModelImpl.kt:75)
at com.intellij.workspaceModel.ide.impl.jps.serialization.JpsProjectModelSynchronizer$applyLoadedStorage$1.run(JpsProjectModelSynchronizer.kt:212)
at com.intellij.openapi.application.WriteAction.lambda$runAndWait$2(WriteAction.java:115)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteActionWithClass(ApplicationImpl.java:935)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:961)
at com.intellij.openapi.application.WriteAction.compute(WriteAction.java:96)
at com.intellij.openapi.application.WriteAction.lambda$computeAndWait$3(WriteAction.java:149)
at com.intellij.openapi.application.WriteThread.lambda$submit$0(WriteThread.java:27)
at com.intellij.openapi.application.WriteThread.lambda$submit$1(WriteThread.java:43)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:214)
at com.intellij.openapi.application.TransactionGuardImpl.access$200(TransactionGuardImpl.java:21)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:196)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:805)
at com.intellij.openapi.application.impl.ApplicationImpl.lambda$invokeLaterOnWriteThread$10(ApplicationImpl.java:794)
at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:82)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:131)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:47)
at com.intellij.openapi.application.impl.FlushQueue$FlushNow.run(FlushQueue.java:187)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:776)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:746)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:891)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:760)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:447)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:818)
at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:446)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:805)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:492)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Suppressed: java.lang.RuntimeException
at com.intellij.openapi.application.WriteAction.computeAndWait(WriteAction.java:158)
at com.intellij.openapi.application.WriteAction.computeAndWait(WriteAction.java:128)
at com.intellij.openapi.application.WriteAction.runAndWait(WriteAction.java:114)
at com.intellij.workspaceModel.ide.impl.jps.serialization.JpsProjectModelSynchronizer.applyLoadedStorage(JpsProjectModelSynchronizer.kt:209)
at com.intellij.workspaceModel.ide.impl.jps.serialization.JpsProjectModelSynchronizer.loadProject(JpsProjectModelSynchronizer.kt:229)
at com.intellij.workspaceModel.ide.impl.jps.serialization.DelayedProjectSynchronizer.runActivity(DelayedProjectSynchronizer.kt:23)
at com.intellij.ide.startup.impl.StartupManagerImpl.runStartupActivity(StartupManagerImpl.kt:312)
at com.intellij.ide.startup.impl.StartupManagerImpl.runActivityAndMeasureDuration(StartupManagerImpl.kt:293)
at com.intellij.ide.startup.impl.StartupManagerImpl.runActivityAndMeasureDuration$default(StartupManagerImpl.kt:288)
at com.intellij.ide.startup.impl.StartupManagerImpl$runPostStartupActivities$1$1.run(StartupManagerImpl.kt:245)
at com.intellij.openapi.project.DumbServiceImpl.runWithWaitForSmartModeDisabled(DumbServiceImpl.java:645)
at com.intellij.ide.startup.impl.StartupManagerImpl$runPostStartupActivities$1.accept(StartupManagerImpl.kt:244)
at com.intellij.ide.startup.impl.StartupManagerImpl$runPostStartupActivities$1.accept(StartupManagerImpl.kt:62)
at com.intellij.openapi.extensions.impl.ExtensionPointImpl.processWithPluginDescriptor(ExtensionPointImpl.java:299)
at com.intellij.openapi.extensions.ExtensionPointName.processWithPluginDescriptor(ExtensionPointName.java:144)
at com.intellij.ide.startup.impl.StartupManagerImpl.runPostStartupActivities(StartupManagerImpl.kt:239)
at com.intellij.ide.startup.impl.StartupManagerImpl.access$runPostStartupActivities(StartupManagerImpl.kt:62)
at com.intellij.ide.startup.impl.StartupManagerImpl$projectOpened$3$1.run(StartupManagerImpl.kt:189)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:188)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:624)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:698)
at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:646)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:623)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:66)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:175)
at com.intellij.openapi.progress.util.BackgroundTaskUtil.runUnderDisposeAwareIndicator(BackgroundTaskUtil.java:277)
at com.intellij.openapi.progress.util.BackgroundTaskUtil.runUnderDisposeAwareIndicator(BackgroundTaskUtil.java:255)
at com.intellij.ide.startup.impl.StartupManagerImpl$projectOpened$3.run(StartupManagerImpl.kt:189)
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1426)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
And also another dialog box appears as
Unable to save settings
Failed to save settings. Please restart Android Studio
On the top, in the configuration tab, it now shows Add Configuration where it showed app with an android icon previously.
The project explorer keeps on loading forever. The same problem occurs whenever I try to create a new project as well.
There is no modules.xml file and some folders in the .idea folder are missing which the previous projects have.
What I have tried so far
Invalidated caches and Restarted
Deleted .idea and .app folder and restarted
Created a new project to check if the same error occurs
Uninstalled and reinstalled Android studio
Clicked on Repair IDE and followed the steps
Installed previous android studio versions and checked
But none the above steps seem to help resolve the issue.

I know it's an old post, but it's relating to a similar issue and might still be of use:
Android Studio - Gradle sync failed: Already disposed
As stated,
As it turned out, the problem was that I was trying to open a project directory that was a symlink to the actual location (on the same partition). Gradle (on command line) had no issues building the project from the symlinked location, however, opening it in Android Studio resulted in the obscure and non helpful error described above.
Also, some have reported this worked for them:
Delete module folder and modules.xml file under .idea folder.
Close Android Studio
Reopen and sync
So it might effectively be because your module.xml file is missing

For me what helped was (ignoring the root cause of this issue)
removing the project from my local machine
and cloning it again. Then reopening it in AS.
I am on Mac btw.
(Try to restart AS (or Intelli) and clear cache first, before doing this.)
Basically:
Close Android Studio
rm -rf Project-Directory
git clone via commandline (or AS, both works)
reopen AS and import project
Since I don't have time to fiddle around with all the possible options
that you find on the net, to fix this issue, this was the fasted approach.

java.lang.IncompatibleClassChangeError error while lauching sdkmanager.bat from cmd for Android Sdk installation

I have downloaded sdk-tools-windows-4333796.zip file from official website and extracted in a folder. But I am facing below issue while opening sdkmanager.bat from cmd.
Error : Exception in thread "main"
java.lang.IncompatibleClassChangeError at
java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodH
andleNatives.java:383) at
com.android.sdklib.tool.sdkmanager.InstallAction.register(InstallActi
on.java:46) at
com.android.sdklib.tool.sdkmanager.SdkManagerCliSettings.(Sdk
ManagerCliSettings.java:65) at
com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.j
ava:57) at
com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.j
ava:48) Caused by: java.lang.NoSuchMethodException: no such method:
java.lang.invoke.Lam
bdaMetafactory.metafactory(Lookup,String,MethodType,MethodType,MethodHandle,Meth
odType)CallSite/invokeStatic at
java.lang.invoke.MemberName.makeAccessException(MemberName.java:765)
at
java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:882
) at
java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.jav
a:1018) at
java.lang.invoke.MethodHandles$Lookup.linkMethodHandleConstant(Method
Handles.java:1322) at
java.lang.invoke.MethodHandleNatives.linkMethodHandleConstant(MethodH
andleNatives.java:381) ... 4 more Caused by:
java.lang.NoSuchMethodError: java.lang.invoke.LambdaMetafactory.metaf
actory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invok
e/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/l
ang/invoke/MethodType;)Ljava/lang/invoke/CallSite; at
java.lang.invoke.MethodHandleNatives.resolve(Native Method) at
java.lang.invoke.MemberName$Factory.resolve(MemberName.java:854)
at
java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:879
) ... 7 more

I installed the whole Android Studio that comes with the SDK Manager.
Others seem to have solved this by updating Java or installing the latest Java jdk.
If that doesnt help post your Java version here.

Internal Error When Updating Android Studio

Every time I try to update Android Studio it downloads and then this pops up:
Internal error. Please report to http://code.google.com/p/android/issues
java.io.IOException: Cannot restart application: Can't obtain static newInstance method for class com.sun.jna.Structure
at com.intellij.util.Restarter.scheduleRestart(Restarter.java:76)
at com.intellij.idea.Main.installPatch(Main.java:184)
at com.intellij.idea.Main.main(Main.java:73)
Caused by: java.lang.UnsatisfiedLinkError: Can't obtain static newInstance method for class com.sun.jna.Structure
at com.sun.jna.Native.initIDs(Native Method)
at com.sun.jna.Native.<clinit>(Native.java:135)
at com.intellij.util.Restarter.restartOnWindows(Restarter.java:106)
at com.intellij.util.Restarter.scheduleRestart(Restarter.java:67)
... 2 more
2014-11-06 14:31:23 [Patch] Original patch exists: C:\Users\Aidan\AppData\Local\Temp\jetbrains.patch.jar.androidstudio
2014-11-06 14:31:23 [Patch] Restarted cmd: [C:\Users\Aidan\AppData\Local\Temp\VistaLauncher8848951449880199676.exe, C:\Program Files\Java\jdk1.8.0_11\jre\bin\java, -Xmx500m, -classpath, C:\Users\Aidan\AppData\Local\Temp\jetbrains.patch.jar.androidstudio_copy;C:\Users\Aidan\AppData\Local\Temp\log4j.jar.AndroidStudio_copy, -Djava.io.tmpdir=C:\Users\Aidan\AppData\Local\Temp\, -Didea.updater.log=C:\Users\Aidan\.AndroidStudioBeta\system\log, -Dswing.defaultlaf=com.sun.java.swing.plaf.windows.WindowsLookAndFeel, com.intellij.updater.Runner, install, D:\Android Studio]
2014-11-06 14:31:23 Exception: java.io.IOException: Cannot restart application: Can't obtain static newInstance method for class com.sun.jna.Structure
I always end up downloading the update from the site, deleting the original, then extracting the new version alongside the sdk folder. Is there any way to fix this?

I found the solution
First, you should delete 2 folders C:\Users\USER_NAME\.android, C:\Users\USER_NAME\.AndroidStudio And delete all files in C:\Users\USER_NAME\AppData\Local\Temp
Second, remove and re-install Android Studio
this way works perfectly

Problem solved. Sort of..
Adding the line -Djna.nosys=true to the studio.vmoptions file in the /bin folder fixed my problem and I am now updated. I found the solution from here: https://code.google.com/p/android/issues/detail?id=78656

Unable to create Emulator for android

I'm trying to create an emulator by choosing emulator-x86.exe from tools folder. Whenever I created I'm getting the below error, and emulator is not getting created. Whats is the issue?
Ant build error=Execute failed: java.io.IOException: Cannot run
program "${emulator.dir}\android.bat" (in directory "ECLIPSE_PATH\configuration\org.eclipse.osgi\bundles\370\1.cp\emulators\android"):CreateProcess error=2, The system cannot find the file specified
Please help me friends

you can follow this tutorial or
do like this
hw.lcd.density=252
sdcard.size=32M
skin.name=NEXUS-ONE
skin.path=platforms/android-10/skins/NEXUS-ONE
hw.cpu.arch=arm
hw.keyboard.lid=no
abi.type=armeabi
hw.keyboard=no
vm.heapSize=24
hw.ramSize=256
image.sysdir.1=platforms/android-10/images/

Eclipse crash after opening .xml file

i am starting with android development
i have created some sample application but
when i am opening .xml file resides in res/layout/main.xml
after that my eclipse crash and close.
i even try "open with android layout editor" which also crashes eclipse.
i am not getting why this problem occur.
my os is ubantu 9.04
and using eclipse Galileo
EDIT:
i am getting following error in my eclipse log file. what dose this means???
!ENTRY com.android.ide.eclipse.adt 4 0 2011-04-29 16:56:16.476
!MESSAGE loadAndParseRClass failed to find class com.saltriver.gui.R
!STACK 0
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.android.ide.eclipse.adt.internal.resources.manager.ProjectClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at com.android.ide.eclipse.adt.internal.resources.manager.CompiledResourcesMonitor.loadAndParseRClass(Unknown Source)
at com.android.ide.eclipse.adt.internal.resources.manager.CompiledResourcesMonitor.fileChanged(Unknown Source)
at com.android.ide.eclipse.adt.internal.resources.manager.GlobalProjectMonitor$DeltaVisitor.visit(Unknown Source)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:68)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:79)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:48)
at com.android.ide.eclipse.adt.internal.resources.manager.GlobalProjectMonitor$1.resourceChanged(Unknown Source)
at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:291)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:313)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1022)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1809)
at org.eclipse.core.internal.events.NotificationManager$NotifyJob.run(NotificationManager.java:40)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

"crash" is not very specific. Look into the file .metadata/.log in your workspace to see if Eclipse wrote an error message before it died.
If that doesn't help, start Eclipse from a console with -debug -console -consoleLog.
[EDIT] The error means that you're using Java X to run Eclipse but a plugin needs Java Y (where Y > X).
the usual case is that you run Eclipse with Java 5 and you have a plugin which needs Java 6. Unfortunately, the error message is useless: It doesn't tell you which class is the problem, from which JAR it came, which version it has and which versions are supported - The code has all the information but some smart guy decided that you don't need that. Pity.
So try to get the latest version of Java to run the IDE.
This is independent of the Java version which you use to build and run your projects!! It's just the VM which Eclipse uses to load its plugins. For VMs used in projects, see the Eclipse preferences.

Close 'Eclipse'
Go to your Eclipse folder open eclipse.ini file in any text editor.
after the line which says openFile add following two lines.
-vm
C:\Program Files\Java\jdk1.6.0_24\bin\javaw.exe
(This folder path may vary according to your java installation directory).
save and close.
Open eclipse and tadaaaa!!! you can open xml files again. :)