this SDK is not supported by the compiler (the SDK is built with 'Apple Swift version 5.7 (swiftlang-5.7.0.127.4 clang-1400.0.29.50)', while this compiler is 'Apple Swift version 5.6.1 (swiftlang-5.6.0.323.66 clang-1316.0.20.12)').
Generated by Apple Swift version 5.7 not working on Apple Swift version 5.6.1
It sound like you’re trying to mix tool versions and SDK versions. That’s not supported. The tools within Xcode are only guaranteed to work with the SDKs in that same version of Xcode. Likewise if you’re using the separate Command Line Tools package.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"