IntelliJ & Kotlin

Just a note about a recurring problem with IntelliJ IDEA and Kotlin, under MacOs Catalina.
Sometime appears a "Kotlin not configured" message in a Kotlin based project.

When this happens usually a lot of libraries are not recognized as well, ending up with tons of errors.
Looking on google didn't show much.
Here some advices found :

• go on File - Invalidate Caches / Restart
  Not always works, usually after that IntelliJ try to rebuild everything and end up with the same error
• manually remove the IntelliJ Kotlin artifacts.
  It is indicated the directory ~/.m2  as base but on MacOs there is no such directory

I did solve in this way :

• open the build.gradle file
• change the version of the Kotlin used - should rebuild indexes and everything
• change back the version of Kotlin used

Should do the trick