Software caused connection abort. Error returned in reply:Connection invalid

Question

My Xcode 9 gives the message to which I don\'t know how to respond. I want to run the app to my simulator, and I am getting this weird message. Attaching the snapshot for the sa

Answer 1

Swapping between 2 versions of Xcode (8.3.3 and 9 GM) gave me this problem in Xcode 9. Solved by Xcode->Preferences->Locations->Command Line Tools, set to Xcode 9. Needed to quit Xcode and the simulator, but it then worked.