I have several PDF files that I created by printing web content to PDF format. With some, I receive an error that Calibre cannot open the file. This is a frequent error explanation:
Spoiler:
calibre, version 8.15.0
ERROR: Loading book failed: Failed to open the book at D:\Calibre Libraries\Bridge Library & Notes\Gerben Dirksen\Defense against Polish Club (503)\Defense against Polish Club - Gerben Dirksen.pdf. Click "Show details" for more info.
Failed to convert book: D:\Calibre Libraries\Bridge Library & Notes\Gerben Dirksen\Defense against Polish Club (503)\Defense against Polish Club - Gerben Dirksen.pdf with error:
InputFormatPlugin: PDF Input running
on D:\Calibre Libraries\Bridge Library & Notes\Gerben Dirksen\Defense against Polish Club (503)\Defense against Polish Club - Gerben Dirksen.pdf
pdftohtml log:
Page-1
Page-2
Page-3
Page-4
Page-5
Failed to run pipe worker with command: from calibre.srv.render_book import viewer_main; viewer_main()
Traceback (most recent call last):
File "runpy.py", line 198, in _run_module_as_main
File "runpy.py", line 88, in _run_code
File "site.py", line 83, in <module>
File "site.py", line 78, in main
File "site.py", line 50, in run_entry_point
File "calibre\utils\ipc\worker.py", line 194, in main
File "<string>", line 1, in <module>
File "calibre\srv\render_book.py", line 851, in viewer_main
File "calibre\srv\render_book.py", line 842, in render_for_viewer
File "calibre\srv\render_book.py", line 819, in render
File "calibre\ebooks\oeb\iterator\book.py", line 64, in extract_book
File "calibre\customize\conversion.py", line 242, in __call__
File "calibre\ebooks\conversion\plugins\pdf_input.p y", line 66, in convert
File "calibre\ebooks\pdf\reflow.py", line 1473, in __init__
File "calibre\ebooks\pdf\reflow.py", line 1871, in find_header_footer
IndexError: list index out of range
I don't know how to interpret or fix this error, or whether there is a trick to creating PDFs that can be read in Calibre. This is not a disabling error because these files will open correctly in a PDF program directly.
I'd appreciate any insights or suggestions.