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