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    Well, that really seems to be the case, thanks for the heads up. Apparently, this has been discussed many times before, but I would expect something like this to be explicitly stated in the kata description, not left out in some vague discussion.

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    You might be throwing an instance of the Error class instead of the value provided as the parameter err. I had the same issue and that's how I got around it.

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    There's no way this is a 4 kyu problem, it's 6 at best. Besides, it doesn't even work in the first place. As stated before, it expects 1.2.3.4 to be invalid.