calibre, version 5.27.0
ERROR: Loading book failed: Failed to open the book at C:\Users\timot\Documents\Calibre Library\Unknown\furiganalysed slime (85)\furiganalysed slime - Unknown.epub. Click "Show details" for more info.
Failed to convert book: C:\Users\timot\Documents\Calibre Library\Unknown\furiganalysed slime (85)\furiganalysed slime - Unknown.epub with error:
WARNING: Epub doesn't contain a valid mimetype declaration
InputFormatPlugin: EPUB Input running
on C:\Users\timot\Documents\Calibre Library\Unknown\furiganalysed slime (85)\furiganalysed slime - Unknown.epub
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Traceback (most recent call last):
File "calibre\ebooks\metadata\epub.py", line 99, in __init__
File "calibre\ebooks\metadata\epub.py", line 153, in open
File "calibre\utils\zipfile.py", line 1006, in read
File "calibre\utils\zipfile.py", line 1034, in open
File "calibre\utils\zipfile.py", line 995, in getinfo
KeyError: "There is no item named 'META-INF/container.xml' in the archive"
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "calibre\customize\ui.py", line 433, in get_file_type_metadata
File "calibre\customize\builtins.py", line 169, in get_metadata
File "calibre\ebooks\metadata\epub.py", line 238, in get_quick_metadata
File "calibre\ebooks\metadata\epub.py", line 217, in get_metadata
File "calibre\ebooks\metadata\epub.py", line 165, in get_zip_reader
File "calibre\ebooks\metadata\epub.py", line 148, in __init__
File "calibre\ebooks\metadata\epub.py", line 102, in __init__
calibre.ebooks.metadata.epub.EPubException: missing OCF container.xml file
Traceback (most recent call last):
File "calibre\ebooks\conversion\plugins\epub_input.py", line 241, in find_opf
FileNotFoundError: [Errno 2] No such file or directory: 'META-INF/container.xml'
Traceback (most recent call last):
File "runpy.py", line 194, in _run_module_as_main
File "runpy.py", line 87, in _run_code
File "site.py", line 82, in <module>
File "site.py", line 77, in main
File "site.py", line 49, in run_entry_point
File "calibre\utils\ipc\worker.py", line 197, in main
File "<string>", line 1, in <module>
File "calibre\srv\render_book.py", line 824, in viewer_main
File "calibre\srv\render_book.py", line 815, in render_for_viewer
File "calibre\srv\render_book.py", line 792, in render
File "calibre\ebooks\oeb\iterator\book.py", line 63, in extract_book
File "calibre\customize\conversion.py", line 245, in __call__
File "calibre\ebooks\conversion\plugins\epub_input.py", line 281, in convert
ValueError: C:\Users\timot\Documents\Calibre Library\Unknown\furiganalysed slime (85)\furiganalysed slime - Unknown.epub is not a valid EPUB file (could not find opf)
I also tried downloading the conversion as 1 text file, but it downloaded an empty text file. Any thoughts?