Further, you may not have actually found real errors yourself! If you have footnotes, it will check the links for them, which you may not have. Better be sure that the errors are truly not real. I have found most of them to be real.
If this is only for you, then don't worry about it...why are you concerned? If it is for others, then their machine may fail on it or display badly, as has been stated above.
The real problem is that making epubs is not totally easy or completely automatable, something which epubcheck is showing you.
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