Execution failed with backendless: Please solve this problem quick

General
1

Error:Execution failed for task ‘:app:transformResourcesWithMergeJavaResForDebug’. > com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK weborb.tasks File1: E:\androidAPPS\NearBY\app\libs\backendless.jar File2: C:\Users\RAHUL.gradle\caches\modules-2\files-2.1\com.backendless\backendless\3.0.11\fbdf1b3f7412ec5029822879e19e1031008cb4f9\backendless-3.0.11.jar

Whole message:

Information:Gradle tasks [:app:clean, :app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar, :app:prepareDebugUnitTestDependencies, :app:assembleDebug]
:app:clean
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72311Library
:app:prepareComAndroidSupportDesign2311Library
:app:prepareComAndroidSupportMediarouterV72300Library
:app:prepareComAndroidSupportMultidex101Library
:app:prepareComAndroidSupportRecyclerviewV72311Library
:app:prepareComAndroidSupportSupportV42311Library
:app:prepareComGoogleAndroidGmsPlayServices840Library
:app:prepareComGoogleAndroidGmsPlayServicesAds840Library
:app:prepareComGoogleAndroidGmsPlayServicesAnalytics840Library
:app:prepareComGoogleAndroidGmsPlayServicesAppindexing840Library
:app:prepareComGoogleAndroidGmsPlayServicesAppinvite840Library
:app:prepareComGoogleAndroidGmsPlayServicesAppstate840Library
:app:prepareComGoogleAndroidGmsPlayServicesAuth840Library
:app:prepareComGoogleAndroidGmsPlayServicesBase840Library
:app:prepareComGoogleAndroidGmsPlayServicesBasement840Library
:app:prepareComGoogleAndroidGmsPlayServicesCast840Library
:app:prepareComGoogleAndroidGmsPlayServicesDrive840Library
:app:prepareComGoogleAndroidGmsPlayServicesFitness840Library
:app:prepareComGoogleAndroidGmsPlayServicesGames840Library
:app:prepareComGoogleAndroidGmsPlayServicesGcm840Library
:app:prepareComGoogleAndroidGmsPlayServicesIdentity840Library
:app:prepareComGoogleAndroidGmsPlayServicesLocation840Library
:app:prepareComGoogleAndroidGmsPlayServicesMaps840Library
:app:prepareComGoogleAndroidGmsPlayServicesMeasurement840Library
:app:prepareComGoogleAndroidGmsPlayServicesNearby840Library
:app:prepareComGoogleAndroidGmsPlayServicesPanorama840Library
:app:prepareComGoogleAndroidGmsPlayServicesPlus840Library
:app:prepareComGoogleAndroidGmsPlayServicesSafetynet840Library
:app:prepareComGoogleAndroidGmsPlayServicesVision840Library
:app:prepareComGoogleAndroidGmsPlayServicesWallet840Library
:app:prepareComGoogleAndroidGmsPlayServicesWearable840Library
:app:prepareDebugDependencies
:app:compileDebugAidl
:app:compileDebugRenderscript
:app:generateDebugBuildConfig
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources
:app:mergeDebugResources
:app:processDebugManifest
:app:processDebugResources
:app:generateDebugSources
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:prepareComAndroidSupportMultidexInstrumentation101Library
:app:prepareDebugAndroidTestDependencies
:app:compileDebugAndroidTestAidl
:app:processDebugAndroidTestManifest
:app:compileDebugAndroidTestRenderscript
:app:generateDebugAndroidTestBuildConfig
:app:generateDebugAndroidTestAssets UP-TO-DATE
:app:mergeDebugAndroidTestAssets
:app:generateDebugAndroidTestResValues UP-TO-DATE
:app:generateDebugAndroidTestResources
:app:mergeDebugAndroidTestResources
:app:processDebugAndroidTestResources
:app:generateDebugAndroidTestSources
:app:mockableAndroidJar UP-TO-DATE
:app:preDebugUnitTestBuild UP-TO-DATE
:app:prepareDebugUnitTestDependencies
:app:compileDebugJavaWithJavac
:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources
:app:buildInfoDebugLoader
:app:transformClassesWithExtractJarsForDebug
:app:transformClassesWithInstantRunVerifierForDebug
:app:transformClassesWithJavaResourcesVerifierForDebug
:app:mergeDebugJniLibFolders
:app:transformNative_libsWithMergeJniLibsForDebug
:app:processDebugJavaRes UP-TO-DATE
:app:transformResourcesWithMergeJavaResForDebug FAILED
Error:Execution failed for task ‘:app:transformResourcesWithMergeJavaResForDebug’.

com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK weborb.tasks
File1: E:\androidAPPS\NearBY\app\libs\backendless.jar
File2: C:\Users\RAHUL.gradle\caches\modules-2\files-2.1\com.backendless\backendless\3.0.11\fbdf1b3f7412ec5029822879e19e1031008cb4f9\backendless-3.0.11.jar
Information:BUILD FAILED
Information:Total time: 26.334 secs
Information:1 error
Information:0 warnings
Information:See complete output in console

2

Anyone solve this problem please.

3

Hi, Rahul.

It is hard to understand your problem by the stacktrace only. In order to reproduce this error you could send us your project at support@backendless.com.
Some additional information would be also helpful:
After what changes did you start to get this error?
Did the project work without errors before?

4

its working now.

5

how did you fixed it ?

6

Rahul, How did you fix the problem with “Duplicate files copied in APK weborb.tasks”

7

The solution is simple , juste go into your project folder and delete the folder .gradle and try to complie the project again

8

I had the same issue. It was result of have Backendless 3 as .jar file(I was using it as part of one of my libraries) and Backendless 4 referenced in gradle file. The solution was:
1.-Delete Backend 3
2.-Recode all issues from Backend 3 to 4
3.-Delete .gradle folder from proyect
4.-In Android Studio select File>Invalidate caches and restart
5.-Rebuilt project

I hope this helps