ebook-viewer fails to open book: find_epub_cover

[codedr]

I tried to open a book in my library. I got 'Failed to open the book...' with the following trace back.

I was able to successfully open the book with okular.
I believe I opened this book before with an older version of calibre.

Traceback (most recent call last):
  File "/usr/bin/calibre-parallel", line 20, in <module>
    sys.exit(main())
  File "/usr/lib64/calibre/calibre/utils/ipc/worker.py", line 188, in main
    exec(sys.argv[-1])
  File "<string>", line 1, in <module>
  File "/usr/lib64/calibre/calibre/srv/render_book.py", line 829, in viewer_main
    render_for_viewer(*args)
  File "/usr/lib64/calibre/calibre/srv/render_book.py", line 822, in render_for_viewer
    extract_annotations=True, virtualize_resources=False, max_workers=0
  File "/usr/lib64/calibre/calibre/srv/render_book.py", line 801, in render
    book_metadata=mi, virtualize_resources=virtualize_resources
  File "/usr/lib64/calibre/calibre/srv/render_book.py", line 602, in process_exploded_book
    raster_cover_name, titlepage_name = create_cover_page(container, input_fmt.lower(), is_comic, book_metadata)
  File "/usr/lib64/calibre/calibre/srv/render_book.py", line 304, in create_cover_page
    titlepage_name, raster_cover_name = find_epub_cover(container)
  File "/usr/lib64/calibre/calibre/srv/render_book.py", line 255, in find_epub_cover
    first_page_name = next(container.spine_names)[0]

[kovidgoyal]

You appear to be using a distro calibre package these are not supported. uninstall it and install the official binary from https://calibre-ebook.com/download_linuxand you should be fine. If not then opena bug report and attachthe problem file and I will take a look at it.

[codedr]

calibre version 4.5.0

[theducks]

Originally Posted by codedr

calibre version 4.5.0

If you are thinking that , current version, and Official Version are the same thing.
Don't Some of the Distro folk 'fix' the Calibre code (or dependencies) their way .
The only Official version, comes from Kovid controlled sites

[JSWolf]

A lot of distro version of Calibre are broken.

[codedr]

Originally Posted by codedr

calibre version 4.5.0

call next() on container.spine_names is failing:
<generator object spine_names at 0x7fe23544ddc0>

[codedr]

There's something wrong with the parsing of the epub content
so that the container.spine is incorrect.
I downgraded to calibre-3.48 where the ebook-viewer works.
There appears some method to enable logging of the epub container, but I was not
able to determine how it works, or find any notes in google how to enable it.

[kovidgoyal]

Just opena ticket and attach the file in question. Or if you dont want to do that open it in the editor and run the check book tool or do an EPUB to EPUB conversion, all ofthose will likely fix whatever the issue in the epub is.