had this error too deleted the file it referenced and it worked

deleted this in terminal and it worked. rm /var/folders/0q/_h1zyvxd6cd7plpw0gjdsy3w0000gn/C/clang/ModuleCache/1GS1IUNF6IO19/SwiftShims-2TTN5UXQBRCCQ.pcm

tried the previous version of Xcode still not working.