I have download some books from archive.org, for example the epub and kindle versions from
https://archive.org/details/lyellstravelsinn00lyell
The Calibre reader gives errors on both formats:
calibre, version 2.42.0
ERROR: Could not open ebook: D:\Calibre work\To load\lyellstravelsinn00lyell.epub is not a valid EPUB file (could not find opf)
Traceback (most recent call last):
File "site-packages\calibre\gui2\viewer\main.py", line 37, in run
File "threading.py", line 763, in run
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 100, in __enter__
File "site-packages\calibre\customize\conversion.py", line 241, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\epub_in put.py", line 209, in convert
ValueError: D:\Calibre work\To load\lyellstravelsinn00lyell.epub is not a valid EPUB file (could not find opf)
for the epub, and:
error: unpack requires a string argument of length 6
Failed to render document
Detailed traceback:
Traceback (most recent call last):
File "site-packages\calibre\gui2\lrf_renderer\main.py", line 33, in run
File "site-packages\calibre\ebooks\lrf\lrfparser.py", line 21, in __init__
File "site-packages\calibre\ebooks\lrf\meta.py", line 483, in __init__
File "site-packages\calibre\ebooks\lrf\meta.py", line 98, in __get__
File "site-packages\calibre\ebooks\lrf\meta.py", line 353, in restore_pos
File "site-packages\calibre\ebooks\lrf\meta.py", line 515, in unpack
error: unpack requires a string argument of length 6
for the mobi.
Is this a known problem (I couldn't find anything in the forum) and is there a fix for it?