I am struggling with intellij, I can build my project with gradle but suddenly intellij throws the following error for my common module

Error:(3, 1) Kotlin: The feature "multi platform projects" is experimental and should be enabled explicitly

Anybody had the same experience and can give me a pointer?

Do you get this error from gradle build? Do you use

freeCompilerArgs

compiler task option?

gradle works fine (on the console, also in the gradle view). Even rebuild project is green but the above mentioned error pops up in the messages view. Due to this I cannot longer run tests (unless I activate Delegate IDE run/build actions to gradle)