Hi Shari. Welcome to MR. At a guess I'd say you have an embedded font (AGaramondPro-Regular) that is not listed in the manifest of the OPF file and possibly have accidentally compressed your mimetype file when zipping the package. I haven't uploaded to Apple yet. Can't say I'm particularly looking forward to it either.
I hope someone with better knowledge can point you in the right direction. Good luck and if you find your answer please post back here so others can learn as well.
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