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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*)

I just updated to 2017.3.5 and tried it again without the delegate

i get the error that no SDK is defined for the common module. Yet, that seems to be OK (it is at least also like that when I let IntelliJ create a new multi-platform project)

forgot to mention, specifying the SDK does not help, I still have the same error as initially described