Each module has to have a unique path
2016: It could be because of a .gitmodules
including two entries with the same paths, but square/assertj-android issues 174 points out to another file:
This usually is the result of old
iml
files. Delete them all and re-import.Weird, removing the
.iml
and reimporting worked.
Update 2020: as commented by ArashYounesi in issue 174, Android Studio V4.0 seems to resolve the problem.
The best way to fix this problem is:
Go to Tools-> Android -> Sync Project with Gradle Files
That works for me.
The best way to fix the .iml files (by recreating them) is to do this:
- Close the project in Android Studio
- In Android Studio,
New > Import Project
That fixed it for me, and it was a lot easier than the other stuff I tried (and a lot less complex).
I believe that rewrites the .iml files with you do that.
What did I try? I tried Build > clean/rebuild project
, File > Invalidate caches/restart
, and Sync Project with Gradle Files
. I was going to manually erase my .iml files but then I found out about this solution and it worked.