dexDebug ExecException finished with non-zero exit value 2

Error:Execution failed for task ':app:transformClassesWithDexForDebug'. com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_05\bin\java.exe'' finished with non-zero exit value 2

android {

    compileSdkVersion 21
    buildToolsVersion '21.1.0'

    defaultConfig {
       ...
       targetSdkVersion 21
       multiDexEnabled true
   }
}

1.dexDebug ExecException finished with non-zero exit value 2
需要在gradle中配置下面的代码，原因是引用了多个libraries文件

defaultConfig {
        multiDexEnabled true
}