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Thanks, for better understanding, the identifier is what is highlighted below? Does the number corresponds to the book x x in the main window of Calibre?Thank you very much.
File "site-packages\calibre\library\caches.py", line 89, in run
File "site-packages\calibre\ebooks\metadata\opf2.py", line 1483, in metadata_to_opf
File "site-packages\calibre\ebooks\metadata\opf2.py", line 1469, in <lambda>
File "site-packages\calibre\ebooks\metadata\opf2.py", line 1437, in factory
File "lxml.etree.pyx", line 1414, in lxml.etree._Element.makeelement (src\lxml\lxml.etree.c:44801)
File "apihelpers.pxi", line 123, in lxml.etree._makeElement (src\lxml\lxml.etree.c:13207)
File "apihelpers.pxi", line 111, in lxml.etree._makeElement (src\lxml\lxml.etree.c:13081)
File "apihelpers.pxi", line 264, in lxml.etree._initNodeAttributes (src\lxml\lxml.etree.c:14731)
File "apihelpers.pxi", line 1339, in lxml.etree._utf8 (src\lxml\lxml.etree.c:23882)
ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters
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