Anyone experienced with ebooks and publishing on IngramSpark?

I’ve finished exporting an ebook but when I upload to IngramSpark the system gives me this error. I assumed that there was a problem with the date I entered in the metadata in InDesign prior to exporting, but I removed the date entirely and it still gives the same error.

Perhaps the date needs to be formatted a specific way? Or maybe I’m completely wrong and the error is something else?

Thanks!

r/graphic_design - EBOOK QUESTION: EPUB Error Question: OPF-054



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