Android Studio Signed APK ':app:transformClassesAndResourcesWithProguardForRelease'
Solution 1
Try performing a clean build (Build > Clean Project) and buliding again.
If that doesn't work, it's likely Proguard is removing some important classes and/or libraries in your app. Take a look at the warnings generated above the error message in the log. You'll need to add rules to your proguard-rules.pro file to keep the necessary classes. Here is an example of the rules required to keep the Butterknife library.
Solution 2
I had this error, and I don't know why it happened.
I have tried lot of solutions without success.
Except adding these lines to my ProGuard file (proguard-rules.pro) :
-ignorewarnings
-keep class * {
public private *;
}
Then Clean and Rebuilt, then generate release apk.
Thanks to Rahul...
Related videos on Youtube
fabienbranchel
Updated on September 15, 2022Comments
-
fabienbranchel over 1 year
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'
I followed the advice, it didn't works. So, I tried to update my
buildToolsVersion
to23.0.2
.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 ?
-
Harv over 5 yearsThanks - after frigging around with 'version' compatibility around gradle this was actually the fix for me.
-
Nic Dahlquist about 5 yearsNote that this directive will prevent proguard from removing any unused classes, which may greatly increase the size of your app. You may want to consider using a more targeted directive (for example, only keeping the package that is causing the original error).