Can anyone please help me to understand this crash log.

Consider this:

Last Exception Backtrace:
0   CoreFoundation  … __exceptionPreprocess + 228 (NSException.m:172)
1   libobjc.A.dylib … objc_exception_throw + 56 (objc-exception.mm:557)
2   CoreFoundation  … +[NSException raise:format:arguments:] + 104 (NSException.m:136)
3   Foundation      … -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 112 (NSException.m:157)
4   UIKitCore       … __45-[UICollectionViewData validateLayoutInRect:]_block_invoke + 1100 (UICollectionViewData.m:447)

Something within UICollectionView detected a problem and threw a language exception.

It’s hard to say what that problem might be. Can you reproduce the crash yourself?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Could you show the code where the crash occurs ?