You should definitely file a bug about this. Even if this is the result of a version incompatibility — and I have no information on that front, either way — the error message should be better.
Please post your bug number, just for the record.
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
That is a great idea, I will file the bug report today. Hopefully it’s just a glitch and not an intentional feature.