title: why i get Some file crunching failed after i rename drawable file to .9.png?
body: <p>I am testing 9-patch image .<br>
  Before everything works fine , and i rename <code>drawable</code> file <code>ic_button_beat_box_default.png</code> to <code>ic_button_beat_box_default.9.png</code> , then i get error : </p>
  
  <blockquote>
    <p>Some file crunching failed, see logs for details</p>
  </blockquote>
  
  <p>. Then i rename back , it works normal. So how this happens ? <br/></p>
  
  <p>The complete error is :</p>
  
  <pre><code>FAILURE: Build failed with an exception.
  
  * What went wrong:
  Execution failed for task ':app:mergeDebugResources'.
  &gt; Some file crunching failed, see logs for details
  
  * Try:
  Run with --info or --debug option to get more log output.
  
  * Exception is:
  org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:mergeDebugResources'.
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
      at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
      ...
  Caused by: java.lang.RuntimeException: Some file crunching failed, see logs for details
      at com.android.builder.png.QueuedCruncher.waitForAll(QueuedCruncher.java:260)
      at com.android.builder.png.QueuedCruncher.end(QueuedCruncher.java:280)
      at com.android.ide.common.res2.MergedResourceWriter.end(MergedResourceWriter.java:132)
      at com.android.ide.common.res2.DataMerger.mergeData(DataMerger.java:291)
      at com.android.ide.common.res2.ResourceMerger.mergeData(ResourceMerger.java:48)
      at com.android.build.gradle.tasks.MergeResources.doIncrementalTaskAction(MergeResources.java:250)
      at com.android.build.gradle.internal.tasks.IncrementalTask.taskAction(IncrementalTask.java:124)
      at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.doExecute(AnnotationProcessingTaskFactory.java:244)
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:220)
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.execute(AnnotationProcessingTaskFactory.java:231)
      at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:209)
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
      at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
      ... 57 more
  </code></pre>