[JSWolf]

Originally Posted by Sheeba

When I convert AZW files to EPUB, Calibre throws an error when I try to open them:

-------------------------------------------------------------------

Spoiler:

calibre, version 4.8.0
ERROR: Loading book failed: Failed to open the book at C:\eBdata\Test.epub. Click "Show details" for more info.

Traceback (most recent call last):
File "site-packages\calibre\gui2\viewer\ui.py", line 371, in _load_ebook_worker
File "site-packages\calibre\gui2\viewer\convert_book.py", line 234, in prepare_book
File "site-packages\calibre\gui2\viewer\convert_book.py", line 191, in do_convert
ConversionFailure: Failed to convert book: C:\eBdata\Test.epub with error:
Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 428, in get_file_type_metadata
File "site-packages\calibre\customize\builtins.py", line 194, in get_metadata
File "site-packages\calibre\ebooks\metadata\epub.py", line 238, in get_quick_metadata
File "site-packages\calibre\ebooks\metadata\epub.py", line 219, in get_metadata
File "site-packages\calibre\ebooks\metadata\opf.py", line 43, in get_metadata
File "site-packages\calibre\ebooks\metadata\utils.py", line 46, in parse_opf
File "site-packages\calibre\utils\xml_parse.py", line 31, in safe_xml_fromstring
File "src/lxml/etree.pyx", line 3222, in lxml.etree.fromstring
File "src/lxml/parser.pxi", line 1877, in lxml.etree._parseMemoryDocument
File "src/lxml/parser.pxi", line 1758, in lxml.etree._parseDoc
File "src/lxml/parser.pxi", line 1068, in lxml.etree._BaseParser._parseUnicodeDoc
File "src/lxml/parser.pxi", line 601, in lxml.etree._ParserContext._handleParseResultDoc
File "src/lxml/parser.pxi", line 711, in lxml.etree._handleParseResult
File "src/lxml/parser.pxi", line 640, in lxml.etree._raiseParseError
XMLSyntaxError: Char 0x0 out of allowed range, line 21, column 50 (line 21)
InputFormatPlugin: EPUB Input running
on C:\eBdata\Test.epub
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Python function terminated unexpectedly
Char 0x0 out of allowed range, line 21, column 50 (line 21) (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 114, in main
File "site.py", line 88, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 189, in main
File "<string>", line 1, in <module>
File "site-packages\calibre\srv\render_book.py", line 848, in viewer_main
File "site-packages\calibre\srv\render_book.py", line 841, in render_for_viewer
File "site-packages\calibre\srv\render_book.py", line 816, in render
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 64, in extract_book
File "site-packages\calibre\customize\conversion.py", line 246, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\epub_in put.py", line 285, in convert
File "site-packages\calibre\ebooks\metadata\opf2.py", line 589, in __init__
File "site-packages\calibre\ebooks\metadata\utils.py", line 46, in parse_opf
File "site-packages\calibre\utils\xml_parse.py", line 31, in safe_xml_fromstring
File "src/lxml/etree.pyx", line 3222, in lxml.etree.fromstring
File "src/lxml/parser.pxi", line 1877, in lxml.etree._parseMemoryDocument
File "src/lxml/parser.pxi", line 1758, in lxml.etree._parseDoc
File "src/lxml/parser.pxi", line 1068, in lxml.etree._BaseParser._parseUnicodeDoc
File "src/lxml/parser.pxi", line 601, in lxml.etree._ParserContext._handleParseResultDoc
File "src/lxml/parser.pxi", line 711, in lxml.etree._handleParseResult
File "src/lxml/parser.pxi", line 640, in lxml.etree._raiseParseError
File "<string>", line 21
lxml.etree.XMLSyntaxError: Char 0x0 out of allowed range, line 21, column 50

-------------------------------------------------------------------


I also can't open those EPUB files in Microsoft Edge either - *however*, I can open them just fine on Android.

So what is Calibre doing that's not standard, and how can I make these EPUB files universally openable?

Where did these eBooks come from and can you give us some of the titles? Thanks.