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The Firebase implementation within an AAR I'm using causes my App to crash

I had been contacted to put a new library in the form of an AAR into my application. It worked fine before adding this AAR, but after that, every time I start it up, it crashes with the following stacktrace:
09-10 21:10:55.272 10354-10354/? W/System.err: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/tasks/TaskCompletionSource;
at com.google.firebase.remoteconfig.FirebaseRemoteConfig.zza(Unknown Source)
at com.google.firebase.remoteconfig.FirebaseRemoteConfig.fetch(Unknown Source)
at com.picmix.mobile.activity.SplashActivity.onCreate(SplashActivity.java:89)
at android.app.Activity.performCreate(Activity.java:6093)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2458)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2577)
at android.app.ActivityThread.access$1000(ActivityThread.java:164)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1462)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:160)
at android.app.ActivityThread.main(ActivityThread.java:5541)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:964)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:759)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.tasks.TaskCompletionSource" on path: DexPathList[[zip file "/data/app/com.picmix.mobile-2/base.apk"],nativeLibraryDirectories=[/data/app/com.picmix.mobile-2/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
... 16 more
Suppressed: java.lang.ClassNotFoundException: com.google.android.gms.tasks.TaskCompletionSource
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 17 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
From my experience, this kind of error is because I hadn't enabled MultiDex support. The strange thing is that I have it enabled, my gradle file contains the following line:
compile 'com.android.support:multidex:1.0.3'
The application I use in the manifest extends MultiDexApplication instead of just Application.
So is it something with that AAR?

Why the unsigned application does not find the Application class?

The application that I am developing is crashing in some mobiles when it is not signed. When I sign the application, it works perfectly on the same devices that previously made the application crashes.
The error is:
Process: com.my.application, PID: 10293 java.lang.RuntimeException: Unable to instantiate application com.my.application.di.base.App: java.lang.ClassNotFoundException: Didn't find class "com.my.application.di.base.App" on path: DexPathList[[zip file "/data/app/com.my.application-1/base.apk"],nativeLibraryDirectories=[/data/app/com.my.application-1/lib/arm, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:563)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4526)
at android.app.ActivityThread.access$1500(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) Caused by: java.lang.ClassNotFoundException: Didn't find class "com.my.application.di.base.App" on path: DexPathList[[zip file "/data/app/com.my.application-1/base.apk"],nativeLibraryDirectories=[/data/app/com.my.application-1/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newApplication(Instrumentation.java:980)
at android.app.LoadedApk.makeApplication(LoadedApk.java:558)
... 10 more
Suppressed: java.lang.ClassNotFoundException: com.my.application.di.base.App
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
I'm not obfuscating my code, nor use instant run. I'm using multidex.

For creating debug apk create it from Build>Build APK. The issue you are facing is because of instant run.

Do you use proguard or any other method to obfuscate your code?

I think you should use multidex

java.lang.ClassNotFoundException: Didn't find class ".MyApplication" on path: DexPathList[[zip file "/data/app/com.sampledemo.box8demo-1/base.apk"]

I have been trying to solve below issue from 3 days.
Problem : Created new module as a library in android project and created aar file using assembleDebug.
That aar file i have added in another project as a new module ( dependecies also added ) but after installing the app into the device i am getting below error :
6055-26055/com.sampledemo.box8demo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sampledemo.box8demo, PID: 26055
java.lang.RuntimeException: Unable to instantiate application com.NerdNow.NerdNowApplication: java.lang.ClassNotFoundException: Didn't find class "com.NerdNow.NerdNowApplication" on path: DexPathList[[zip file "/data/app/com.sampledemo.box8demo-1/base.apk"],nativeLibraryDirectories=[/data/app/com.sampledemo.box8demo-1/lib/arm64, /vendor/lib64, /system/lib64]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:580)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4699)
at android.app.ActivityThread.access$1600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5441)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.NerdNow.NerdNowApplication" on path: DexPathList[[zip file "/data/app/com.sampledemo.box8demo-1/base.apk"],nativeLibraryDirectories=[/data/app/com.sampledemo.box8demo-1/lib/arm64, /vendor/lib64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newApplication(Instrumentation.java:982)
at android.app.LoadedApk.makeApplication(LoadedApk.java:575)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4699)
at android.app.ActivityThread.access$1600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5441)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)
Suppressed: java.lang.NoClassDefFoundError: com.NerdNow.NerdNowApplication
at dalvik.system.DexFile.defineClassNative(Native Method)
at dalvik.system.DexFile.defineClass(DexFile.java:226)
at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
at dalvik.system.DexPathList.findClass(DexPathList.java:338)
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
... 13 more
Suppressed: java.lang.ClassNotFoundException: com.NerdNow.NerdNowApplication
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 12 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
I have enabled multidex in gradle file as well as extended MultiDexApplication in Application class
Also added multidex dependecy in gradle file
please help me to resolve this issue.

Ok Guys, after many try i found that you can not add dependencies on aar files. you have to include jar for each dependencies.

APK doesn't work on phone but App works normal in Android Studio

I have an App that works without problems in Android Studio, but when I Build the apk and then install it shows stranges behaviors:
1- When App is installing, phone shows me notification that no one permission is necessary for my app (and that is not true, my app works with awareness)
2- After installation, and running, the App crushed, no one screen is showed.
I was thinking that maybe could be a problem with manifest, but as I said in emulator works without problem. First time I see this behavoir. Any idea how to solve it ??
03-28 13:15:22.851 7334-7334/com.itelma.tele D/AndroidRuntime: Shutting down VM
03-28 13:15:22.851 7334-7334/com.itelma.tele E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.itelma.tele, PID: 7334
java.lang.RuntimeException: Unable to instantiate service com.itelma.tele.API_AC.FCMInstanceIdService: java.lang.ClassNotFoundException: Didn't find class "com.itelma.tele.API_AC.FCMInstanceIdService" on path: DexPathList[[zip file "/data/app/com.itelma.tele-2/base.apk"],nativeLibraryDirectories=[/data/app/com.itelma.tele-2/lib/arm, /data/app/com.itelma.tele-2/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3841)
at android.app.ActivityThread.access$2100(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1909)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.itelma.tele.API_AC.FCMInstanceIdService" on path: DexPathList[[zip file "/data/app/com.itelma.tele-2/base.apk"],nativeLibraryDirectories=[/data/app/com.itelma.tele-2/lib/arm, /data/app/com.itelma.tele-2/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3838)
at android.app.ActivityThread.access$2100(ActivityThread.java:229) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1909) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:7325) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
Suppressed: java.lang.ClassNotFoundException: com.itelma.tele.API_AC.FCMInstanceIdService
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 10 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

What is error? and how to solve [closed]

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08-20 18:42:28.284 8769-8769/com.wordpress.prathamesh99wordpress.www.wifiset E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.wordpress.prathamesh99wordpress.www.wifiset, PID: 8769
java.lang.RuntimeException: Unable to instantiate application com.android.tools.fd.runtime.BootstrapApplication: java.lang.ClassNotFoundException: Didn't find class "com.android.tools.fd.runtime.BootstrapApplication" on path: DexPathList[[zip file "/data/app/com.wordpress.prathamesh99wordpress.www.wifiset-1/base.apk"],nativeLibraryDirectories=[/data/app/com.wordpress.prathamesh99wordpress.www.wifiset-1/lib/arm, /vendor/lib, /system/lib]]
at android.app.LoadedApk.makeApplication(LoadedApk.java:680)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6395)
at android.app.ActivityThread.access$1800(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1887)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.tools.fd.runtime.BootstrapApplication" on path: DexPathList[[zip file "/data/app/com.wordpress.prathamesh99wordpress.www.wifiset-1/base.apk"],nativeLibraryDirectories=[/data/app/com.wordpress.prathamesh99wordpress.www.wifiset-1/lib/arm, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.app.Instrumentation.newApplication(Instrumentation.java:1005)
at android.app.LoadedApk.makeApplication(LoadedApk.java:670)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6395) 
at android.app.ActivityThread.access$1800(ActivityThread.java:229) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1887) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:7325) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
Suppressed: java.io.IOException: No original dex files found for dex location (arm) /data/app/com.wordpress.prathamesh99wordpress.www.wifiset-1/base.apk ()
at dalvik.system.DexFile.openDexFileNative(Native Method)
at dalvik.system.DexFile.openDexFile(DexFile.java:295)
at dalvik.system.DexFile.(DexFile.java:80)
at dalvik.system.DexFile.(DexFile.java:59)
at dalvik.system.DexPathList.loadDexFile(DexPathList.java:279)
at dalvik.system.DexPathList.makePathElements(DexPathList.java:248)
at dalvik.system.DexPathList.(DexPathList.java:120)
at dalvik.system.BaseDexClassLoader.(BaseDexClassLoader.java:48)
at dalvik.system.PathClassLoader.(PathClassLoader.java:65)
at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:86)
at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:47)
at android.app.LoadedApk.getClassLoader(LoadedApk.java:438)
at android.app.LoadedApk.makeApplication(LoadedApk.java:663)
... 9 more
Suppressed: java.lang.ClassNotFoundException: com.android.tools.fd.runtime.BootstrapApplication
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 12 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

Run off (Preferences -> Build, Execution, Deployment -> Instant Run -> Enable Instant Run)
https://code.google.com/p/android/issues/detail?id=195044
Error running Android (written in Kotlin) project compiled with Gradle2.0.0-alpha plugin
I think it's the same problem.