Unsupported Modules Detected: Compilation is not supported for following modules: xxxx. Unfortunately you can't have non-Gradle Java modules and Android-Gradle modules in one project.

1. SVN에 구버전 프로젝트를 불러왔더니 해당 오류가 발생

Unsupported Modules Detected: Compilation is not supported for following modules: xxxx. Unfortunately you can't have non-Gradle Java modules and Android-Gradle modules in one project.

2. 해당 오류 검색

https://stackoverflow.com/questions/28668252/android-studio-error-unsupported-modules-detected-compilation-is-not-supported

3.해결

File -> invalidate Caches / Restart