Hi Andreas, > error: #error "This file was generated using the moc from 6.8.2. It" > 21 | #error "This file was generated using the moc from 6.8.2. It" > | ^~~~~ looks like some stray old temporary build files cause this (moc version mismatch, I suppose you have a newer Qt version than 6.8.2?). Have you tried in a new, empty build directory? Cheers, Tobias