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Did you add any files to the ePub after you edited it with Sigil? Unmnaifested files are files that are not listed in the OPF. Also, do any of your filename contain a space? If so, go back into Sigil an remove any spaces in filenames. They can cause problems. Invalid publisher date is an invalid metadata date in the OPF. Invalid publisher is also a metedata issue in the OPF as well as creator.
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