Build.gradle(Project: ~) 가 없어진경우

https://stackoverflow.com/questions/31505263/missing-top-level-build-gradle-in-multi-module-project

1. Closed all the open projects.
2. Removed project from recent projects in "Welcome to Android Studio" window.
3. Now click "Open existing android studio project" & browse to the project repo & select top level build.gradle.