Android Studio Signed APK ':app:transformClassesAndResourcesWithProguardForRelease'
<p>When I try to generate signed in Android Studio, I've got the following error :</p>

<blockquote>
  <p>Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
  java.io.IOException: Please correct the above warnings first.</p>
</blockquote>

<p>Already make some research and find that for example :</p>

<p><a href="https://stackoverflow.com/questions/33877134/errorexecution-failed-for-task-androidtransformclassesandresourceswithprogua">Error:Execution failed for task &#39;:android:transformClassesAndResourcesWithProguardForRelease&#39;</a></p>

<p>I followed the advice, it didn't works. So, I tried to update my <code>buildToolsVersion</code> to <code>23.0.2</code>.</p>

<p>Didn't work too.</p>

<p>It's works only when I modify <code>minifyEnabled</code> to false, and I don't want to. </p>

<p>Can you give me a track please ?</p>