finished with non-zero exit value 2

Error:Execution failed for task ':phoneacompany:dexDebug'.

> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'D:\softing\Java\jdk1.7.0_67\bin\java.exe'' finished with non-zero exit value 2

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出現這個是編譯的時候出現重複的jar包致使的。

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由於在主工程裏面有support-v4.jar，而子工程裏面也有，所以我在編譯的時候，把主工程不進行編譯。 

dependencies {      compile fileTree(dir: 'libs', include: '*.jar', exclude: 'android-support-v4.jar')    }