title: Android Studios RuntimeException: Unexpected exception in dex writer thread
body: <p>I have been getting this strange error the whole of today - anyone know what is going wrong here?</p>
  
  <p>As far as I know, I have been using the multidex library correctly (the below is from the app.gradle file):</p>
  
  <pre><code>defaultConfig {
      applicationId "com.example.simon"
      minSdkVersion 14
      targetSdkVersion 23
      versionCode 1
      versionName "1.0"
      /*Enabling multidex*/
      multiDexEnabled true
  }
  
  dependencies {
      /*    Enabling multidex*/
      compile 'com.android.support:multidex:1.0.1'
  }
  </code></pre>
  
  <p>My top level gradle file is very basic:</p>
  
  <pre><code>buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:1.3.0'
          classpath 'com.google.gms:google-services:1.3.1'
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
      }
  }
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>    Executing tasks: [:app:generateDebugSources,
  :app:generateDebugAndroidTestSources]
  
  Parallel execution with configuration on demand is an incubating
  feature.
  :app:preBuild UP-TO-DATE
  :app:preDebugBuild UP-TO-DATE
  :app:checkDebugManifest
  :app:preReleaseBuild UP-TO-DATE
  :app:prepareComAndroidSupportAppcompatV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportCardviewV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportDesign2301Library UP-TO-DATE
  :app:prepareComAndroidSupportMultidex101Library UP-TO-DATE
  :app:prepareComAndroidSupportPaletteV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportRecyclerviewV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportSupportV42301Library UP-TO-DATE
  :app:prepareComDigitsSdkAndroidDigits162Library UP-TO-DATE
  :app:prepareComFacebookAndroidFacebookAndroidSdk440Library UP-TO-DATE
  :app:prepareComFacebookConcealConceal101Library UP-TO-DATE
  :app:prepareComGithubCurioustechizenAndroidAgoLibrary130Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesAppinvite780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesBase780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesGcm780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesLocation780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesMaps780Library UP-TO-DATE
  :app:prepareComTheartofdevEdmodoAndroidImageCropper104Library UP-TO-DATE
  :app:prepareComTwitterSdkAndroidTweetComposer080Library UP-TO-DATE
  :app:prepareComTwitterSdkAndroidTweetUi131Library UP-TO-DATE
  :app:prepareComTwitterSdkAndroidTwitter161Library UP-TO-DATE
  :app:prepareComTwitterSdkAndroidTwitterCore141Library UP-TO-DATE
  :app:prepareIoFabricSdkAndroidFabric134Library UP-TO-DATE
  :app:prepareDebugDependencies
  :app:compileDebugAidl UP-TO-DATE
  :app:compileDebugRenderscript UP-TO-DATE
  :app:generateDebugBuildConfig UP-TO-DATE
  :app:generateDebugAssets UP-TO-DATE
  :app:mergeDebugAssets UP-TO-DATE
  :app:generateDebugResValues UP-TO-DATE
  :app:processDebugGoogleServices
  :app:generateDebugResources
  :app:mergeDebugResources UP-TO-DATE
  :app:processDebugManifest UP-TO-DATE
  :app:fabricGenerateResourcesDebug
  :app:processDebugResources
  :app:generateDebugSources
  :app:preDebugAndroidTestBuild UP-TO-DATE
  :app:prepareDebugAndroidTestDependencies
  :app:compileDebugAndroidTestAidl UP-TO-DATE
  :app:processDebugAndroidTestManifest UP-TO-DATE
  :app:compileDebugAndroidTestRenderscript UP-TO-DATE
  :app:generateDebugAndroidTestBuildConfig UP-TO-DATE
  :app:generateDebugAndroidTestAssets UP-TO-DATE
  :app:mergeDebugAndroidTestAssets UP-TO-DATE
  :app:generateDebugAndroidTestResValues UP-TO-DATE
  :app:generateDebugAndroidTestResources UP-TO-DATE
  :app:mergeDebugAndroidTestResources UP-TO-DATE
  :app:processDebugAndroidTestResources UP-TO-DATE
  :app:generateDebugAndroidTestSources UP-TO-DATE
  
  BUILD SUCCESSFUL
  
  Total time: 3.913 secs Executing tasks: [:app:assembleDebug]
  
  Parallel execution with configuration on demand is an incubating
  feature.
  :app:preBuild UP-TO-DATE
  :app:preDebugBuild UP-TO-DATE
  :app:checkDebugManifest
  :app:preReleaseBuild UP-TO-DATE
  :app:prepareComAndroidSupportAppcompatV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportCardviewV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportDesign2301Library UP-TO-DATE
  :app:prepareComAndroidSupportMultidex101Library UP-TO-DATE
  :app:prepareComAndroidSupportPaletteV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportRecyclerviewV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportSupportV42301Library UP-TO-DATE
  :app:prepareComDigitsSdkAndroidDigits162Library UP-TO-DATE
  :app:prepareComFacebookAndroidFacebookAndroidSdk440Library UP-TO-DATE
  :app:prepareComGithubCurioustechizenAndroidAgoLibrary130Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesAppinvite780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesBase780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesGcm780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesLocation780Library UP-TO-DATE
  :app:prepareComGoogleAndroidGmsPlayServicesMaps780Library UP-TO-DATE
  :app:prepareComTheartofdevEdmodoAndroidImageCropper104Library
  :app:prepareDebugDependencies
  :app:compileDebugAidl UP-TO-DATE
  :app:compileDebugRenderscript UP-TO-DATE
  :app:generateDebugBuildConfig UP-TO-DATE
  :app:generateDebugAssets UP-TO-DATE
  :app:mergeDebugAssets UP-TO-DATE
  :app:generateDebugResValues UP-TO-DATE
  :app:processDebugGoogleServices
  :app:generateDebugResources
  :app:mergeDebugResources UP-TO-DATE
  :app:processDebugManifest UP-TO-DATE
  :app:fabricGenerateResourcesDebug
  :app:processDebugResources
  :app:generateDebugSources
  :app:processDebugJavaRes UP-TO-DATE
  :app:compileDebugJavaWithJavac UP-TO-DATE
  :app:compileDebugNdk UP-TO-DATE
  :app:compileDebugSources UP-TO-DATE
  :app:collectDebugMultiDexComponents UP-TO-DATE
  :app:packageAllDebugClassesForMultiDex UP-TO-DATE
  :app:shrinkDebugMultiDexComponents UP-TO-DATE
  :app:createDebugMainDexClassList UP-TO-DATE
  :app:dexDebugExecuting
  tasks: [:app:assembleDebug]
  
  Parallel execution with configuration on demand is an incubating
  feature.
  :app:preBuild UP-TO-DATE
  :app:preDebugBuild UP-TO-DATE
  :app:checkDebugManifest
  :app:preReleaseBuild UP-TO-DATE
  :app:prepareComAndroidSupportAppcompatV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportCardviewV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportDesign2301Library UP-TO-DATE
  :app:prepareComAndroidSupportMultidex101Library UP-TO-DATE
  :app:prepareComAndroidSupportPaletteV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportRecyclerviewV72301Library UP-TO-DATE
  :app:prepareComAndroidSupportSupportV42301Library UP-TO-DATE
  :app:prepareComDigitsSdkAndroidDigits162Library UP-TO-DATE
  :app:prepareDebugDependencies
  :app:compileDebugAidl UP-TO-DATE
  :app:compileDebugRenderscript UP-TO-DATE
  :app:generateDebugBuildConfig UP-TO-DATE
  :app:generateDebugAssets UP-TO-DATE
  :app:mergeDebugAssets UP-TO-DATE
  :app:generateDebugResValues UP-TO-DATE
  :app:processDebugGoogleServices
  :app:generateDebugResources
  :app:mergeDebugResources UP-TO-DATE
  :app:processDebugManifest UP-TO-DATE
  :app:fabricGenerateResourcesDebug
  :app:processDebugResources
  :app:generateDebugSources
  :app:processDebugJavaRes UP-TO-DATE
  :app:compileDebugJavaWithJavac UP-TO-DATE
  :app:compileDebugNdk UP-TO-DATE
  :app:compileDebugSources UP-TO-DATE
  :app:collectDebugMultiDexComponents UP-TO-DATE
  :app:packageAllDebugClassesForMultiDex UP-TO-DATE
  :app:shrinkDebugMultiDexComponents UP-TO-DATE
  :app:createDebugMainDexClassList UP-TO-DATE
  :app:dexDebug AGPBI:
  {"kind":"simple","text":"UNEXPECTED TOP-LEVEL
  EXCEPTION:","sources":[{}]} AGPBI:
  {"kind":"simple","text":"java.lang.RuntimeException: Unexpected
  exception in dex writer thread","sources":[{}]} AGPBI:
  {"kind":"simple","text":"\tat
  com.android.dx.command.dexer.Main.runMultiDex(Main.java:397)","sources":[{}]}
  AGPBI: {"kind":"simple","text":"\tat
  com.android.dx.command.dexer.Main.run(Main.java:275)","sources":[{}]}
  AGPBI: {"kind":"simple","text":"\tat
  com.android.dx.command.dexer.Main.main(Main.java:245)","sources":[{}]}
  AGPBI: {"kind":"simple","text":"\tat
  com.android.dx.command.Main.main(Main.java:106)","sources":[{}]}
  
  
   FAILED
  
  FAILURE: Build failed with an exception.
  
  * What went wrong: Execution failed for task ':app:dexDebug'.
  com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command
  'C:\Program Files\Java\jdk1.7.0_76\bin\java.exe'' finished with
  non-zero exit value 2
  
  * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
  
  BUILD FAILED
  
  Total time: 1 mins 5.426 secs
  </code></pre>