Error:Execution failed for task ':app:transformClassesWithDexForDebug'.

使用android studio 时，编译成功但用build apk时却报错 环境： android studio 2.0， jdk1.7 错误：Error:Execution failed for task ':app:transformClassesWithDexForDebug'. > com.android.build.api.transform.TransformException: c

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