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UPDATE: Yes, I removed the < and > from the forum comment -- I omitted it from the first post because I knew it gets mangled in forum posts.
With 3 different valid epubs, your simpler header code worked in the conversion.
That tells me that the problem is not with calibre or the environment but with the specific file.
After testing some more and adding the same file to calibre more than once, I see that a conversion failure will continue with the same file even if you correct or simplify the header code.. I.E., if I try a second time to convert after a failed conversion, it reliably continues to show errors (even if you correct the code snippet or leave it blank).
The workaround is to add the epub again to calibre, and add correct header code again in the PDF OUTPUT. A fresh conversion always works.
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