Error: Unfortunately you can't have non-Gradle Java modules and > Android-Gradle modules in one project

Question

I have an IntelliJ 14.1.2 Project consisting of two modules - one is an Android Gradle based module and the other is a Spring Java-based module with Maven.

gps-track

Answer 1

Writing in 2020 -

If none of these worked, close android studio and then go to

C:\Users\User.AndroidStudio(ANDROID_STUDIO_VERSION)\system and delete the caches folder

Restart your project now, it should work.