com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/bin/java'' finished with non-zero exit value 2

[AdamantG]

:app:dexDebug 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 '/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/bin/java'' 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.

after run $ react-native run-android,it happened like that.

then, I set --stacktrace --debug option, it happened like this:

:app:dexDebug
Unknown source file : UNEXPECTED TOP-LEVEL EXCEPTION:
Unknown source file : com.android.dex.DexException: Multiple dex files define Landroid/support/v7/appcompat/R$anim;
Unknown source file :   at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:596)
Unknown source file :   at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)
Unknown source file :   at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)
Unknown source file :   at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)
Unknown source file :   at com.android.dx.merge.DexMerger.merge(DexMerger.java:189)
Unknown source file :   at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:502)
Unknown source file :   at com.android.dx.command.dexer.Main.runMonoDex(Main.java:334)
Unknown source file :   at com.android.dx.command.dexer.Main.run(Main.java:277)
Unknown source file :   at com.android.dx.command.dexer.Main.main(Main.java:245)
Unknown source file :   at com.android.dx.command.Main.main(Main.java:106)

and, I find this:
http://blog.csdn.net/l00149133/article/details/47834713
it's an issue with the android support library being included twice, but I dont know how to fix it.
and, I find this:
https://github.com/react-community/react-native-image-picker/issues/241

cd android && ./gradlew clean

It work's

then, it happened like this:
52

。。。。

ahhh.....

its so hard...to ...run ...this....app!!!

[AdamantG]

.