“Unknown artifact. Not resolved or indexed” error for scalatest

Question

I\'m trying to modify the build.sbt file to add scalatest dependencies in IntelliJ IDEA. There\'s no error log in the console but I got a Unknown artifact. Not resolv

Answer 1

I had the same problem. File -> Invalidate Caches/Restart... fixed the issue for me.
Just updating/refreshing project didn't work in my case.