When I try to generate signed in Android Studio, I've got the following error :

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

Already make some research and find that for example :

[Error:Execution failed for task ':android:transformClassesAndResourcesWithProguardForRelease'](https://stackoverflow.com/questions/33877134/errorexecution-failed-for-task-androidtransformclassesandresourceswithprogua)

I followed the advice, it didn't works. So, I tried to update my `buildToolsVersion` to `23.0.2`.

Didn't work too.

It's works only when I modify `minifyEnabled` to false, and I don't want to. 

Can you give me a track please ?