The second error is the fact that you nave a entity in the .opf file & apos; (the & belongs next to the letter) in the opf file. It is not a good idea to try and use these sorts of enities in the opf file. You can directly edit the opf if you wish and fix it but using a ' mark instead but Sigil may also fix this one for you. (An ePub is really just a bunch of file in a zip file with a different extension. You can open the file with something like 7zip and then extract and edit the bad files directly and then put them back in the zip file.)
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