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This happens if you are using a storyboard / nib / xib file, and you accidentally register a nib when you meant to register a non-nib file.
Take a look:
register(T.self, forCellReuseIdentifier: T.dequeueIdentifier)
register(UINib(nibName: T.dequeueIdentifier, bundle: nil), forCellReuseIdentifier: T.dequeueIdentifier)
Those are two different functions - make sure you choose the correct one
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