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I am using the Cantook ebook reader (formerly Aldiko) on a Samsung Galaxy Tab S8. Most of the epub files I have will open just fine; however, I’m getting an error with one file that I can’t get around:

OpenError.ProfilesNotSupported: Cannot open a publication with profiles: [Profile(uri=https://readium.org/webpub-manifest/profiles/epub)]

When I open this with Calibre’s reader/editor, I can’t find any reference to that URL. The Calibre library manager recognizes it as epub, and the reader has no trouble opening it.

There is no DRM on the file; I can do as I please to it - but I have no idea what I need to do to make this file readable by Cantook (beyond "remove the profile" somehow), or how to do it.

Advice?

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In sheer desperation, I tried using Calibre to convert it from ePub to Mobi, and then converted the Mobi back to ePub - which seems to have worked. I will probably not mark this answer as accepted, in hopes that someone can come up with a better answer and/or an explanation of just what was going on with the original ePub.

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It's probably using some kind of shortened call to the manifest. There are numerous ways to do that. Evidently completely unnecessary that it happens since epub-->mobi-->epub fixed it. But to find what it is specifically I would have to take a look at the problem epub -- if so I would then expand my own epub knowledge and yours, could be fun. If it's something that needs remain private I understand as well, just thought I'd offer.

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