3rd-party Gradle plug-ins may be the cause

Question

After updating to Android Studio 3.1 I got this error message:

The project works fine and this is mostly just a warning, so my question is what\'s the meani

Answer 1

I restarted Android Studio and the problem disappeared.

Click File -> Invalidate Caches/Restart

Every time I change the gradle file, I must restart Android Studio to or the problem returns.

You can also try this:

1. Re-ordered repositories to:

   mavenCentral()
   maven { url 'https://jitpack.io' }
   google()
   jcenter()
   

2. Clearing this folder: user's ~/.gradle/caches and deleting app build folder manually, then clean and rebuild.