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Well, seems there is an error with the value of attribute "preserveAspectRatio" on the titlepage.xhtml file in your ePub. What is the current value? Try to edit the ePub with Sigil, you will have access to this data easily. Also there is an ePub validation test included with Sigil (it's called Flight Crew), which I believe is better and gives easier to decrypt error messages. Someone please correct me if I'm wrong.
Also, I just checked an ePub I have worked on (one that passed the validation), and on my title page, the preserveAspectRatio is "xMidYMid meet".
Good luck.
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