The error was "OPF contains invalid markup" Kovid stated "That error indicates the OPF file inside the EPUB is corrupted/invalid." This means it was either corrupted or the markup was simply invalid.
Quote:
Python function terminated unexpectedly: 'NoneType' object has no attribute 'tag'
InputFormatPlugin: HTML Input running
on /var/folders/k9/42lg4_8n0pzcyvxrs1n44q040000gn/C/calibre_3.12.0_tmp_G3gFPF/hTCwYH_pl_arc/__MACOSX/OEBPS/._content.opf
Parsing all content...
OPF contains invalid markup, trying to parse it anyway
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If it is your contention that there is a bug and you have multiple books affected simply file a bug report as
described here. Attach a book that exhibits the error to the report (then mark the report private.) This will allow Kovid to have a closer look.