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

Well, I found it is because of apply plugin: 'kotlin-kapt'，if you delete this line in build.gradle(app), then you will build successfully...

Have no idea why this plugin results in these warnings.