android 混淆问题 总是报错

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

java.io.IOException: The output jar [F:\Android\android studio\Balala\app\build\intermediates\multi-dex\release\componentClasses.jar] must be specified after an input jar, or it will be empty.

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

java.io.IOException: The output jar [F:\Android\android studio\Balala\app\build\intermediates\multi-dex\release\componentClasses.jar] must be specified after an input jar, or it will be empty.

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