title: Failed to crunch some files Android Studio
body: <p>Recently I migrated an eclipse project to Android Studio and I am now getting following error when building project</p>
  
  <blockquote>
    <p>AAPT err(Facade for 170558904): libpng error: Not a PNG file<br>
    Error:Execution failed for task ':app:mergeDebugResources'.<br>
     Some
    file crunching failed, see logs for details</p>
  </blockquote>
  
  <p>By following various questions related to this, I renamed all .9.png to .png. It is not even showing filename which is showing error. How can I figure out which file is having that issue</p>