Android Studio: Gradle - build fails -- Execution failed for task ':dexDebug'

Question

Error:

Gradle: Execution failed for task ':vertretungsplan:dexDebug'.
> Failed to run command:
    P:Android-Studiosdkuild-tools18.0.1dx.bat --dex --output P:ProjekteVertretungsplanProjectvertretungsplanuildlibsvertretungsplan-debug.dex P:ProjekteVertretungsplanProjectvertretungsplanuildclassesdebug P:ProjekteVertretungsplanProjectvertretungsplanuilddependency-cachedebug P:Android-Studiosdkextrasandroidm2repositorycomandroidsupportsupport-v418.0.0support-v4-18.0.0.jar P:ProjekteVertretungsplanProjectvertretungsplanlibscommons-io-2.4.jar P:ProjekteVertretungsplanProjectvertretungsplanuildexploded-bundlesVertretungsplanProjectLibrariesActionbarsherlockUnspecified.aarclasses.jar
Error Code:
    2
Output:
    trouble processing:
    bad class file magic (cafebabe) or version (0033.0000)
    ...while parsing de/MayerhoferSimon/Vertretungsplan/LoginActivity$2.class
    ...while processing de/MayerhoferSimon/Vertretungsplan/LoginActivity$2.class
    trouble processing:
    bad class file magic (cafebabe) or version (0033.0000)
    ...while parsing de/MayerhoferSimon/Vertretungsplan/MainActivity$1.class
    ...while processing de/MayerhoferSimon/Vertretungsplan/MainActivity$1.class
    trouble processing:
    bad class file magic (cafebabe) or version (0033.0000)
    ...while parsing de/MayerhoferSimon/Vertretungsplan/YQL/YqlVplanParser.class
    ...while processing de/MayerhoferSimon/Vertretungsplan/YQL/YqlVplanParser.class
    3 warnings
    UNEXPECTED TOP-LEVEL EXCEPTION:
    com.android.dx.util.DexException: Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat$AccessibilityServiceInfoVersionImpl;
        at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:592)
        at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:550)
        at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:531)
        at com.android.dx.merge.DexMerger.mergeDexBuffers(DexMerger.java:168)
        at com.android.dx.merge.DexMerger.merge(DexMerger.java:186)
        at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:300)
        at com.android.dx.command.dexer.Main.run(Main.java:232)
        at com.android.dx.command.dexer.Main.main(Main.java:174)
        at com.android.dx.command.Main.main(Main.java:91)

Project structure:

build.gradle (actionbarsherlock)

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.5.+'
    }
}
apply plugin: 'android-library'

dependencies {
    compile 'com.android.support:support-v4:18.0.0'
}

android {
    compileSdkVersion 18
    buildToolsVersion "18.0.1"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 11
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            res.srcDirs = ['res']
        }
    }
}

build.gradle (vertretungsplan)

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.5.+'
    }
}
apply plugin: 'android'

dependencies {
    compile files('libs/commons-io-2.4.jar')
    compile project(':libraries:actionbarsherlock')
}

android {
    compileSdkVersion 18
    buildToolsVersion "18.0.1"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 11
    }
}

settings.gradle

include ':vertretungsplan', ':libraries:actionbarsherlock'

How can I fix this error?

Answer 1

The right answer is, that some of your jar files does not compile. You should go into your build.gradle file in your project, and look in your dependencies.

If you're just importing some jar files, you could try to remove them and add them one at a time. This will help you determine which one of them causes the error.

In my case, I did just that, and when I was importing the last one, the app compiled. So I think the real problem was that I was importing too many at once. But now it all works.