Hello @Sefa_Bal,
This error is very similar to another one we recently received. Are you in a similar situation, using connected mode and having at least one module bound ? What kind of IntelliJ projects are you using, is it the “new” .idea format or the old .ipr ?
As you can see in this other thread I am not able to reproduce. What would really help us is if you were able to create a small reproducer project (even if your SQ server is private, you can omit those details).
Thanks