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There are several things wrong. First your metadata is not complete. You need an author and title specified, those are mandatory. The other error is that you have files in your ePUB, but they are not specified in the ePUB. They need to be specified in the ePUB. These are all issues with the OPF.
You can choose to fix the OPF by hand, but that can be tricky. You can also fire up Sigil or the Calibre editor to fix the OPF more automatic.
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