Android Studio Signed APK ‘:app:transformClassesAndResourcesWithProguardForRelease’

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 file to keep the necessary classes. Here is an example of the rules required to keep the Butterknife library.

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