[GRiker]

Kovid, I'm seeing an error when opening a file on my desktop under OS X:

calibre, version 1.13.0
ERROR: Failed to open book: Failed to open book, click Show details for more information.

Traceback (most recent call last):
File "site-packages/calibre/gui2/tweak_book/job.py", line 34, in run
File "site-packages/calibre/gui2/tweak_book/boss.py", line 38, in get_container
File "site-packages/calibre/ebooks/oeb/polish/container.py", line 1077, in get_container
File "site-packages/calibre/ebooks/oeb/polish/container.py", line 830, in __init__
File "site-packages/calibre/ebooks/oeb/polish/container.py", line 136, in __init__
InvalidBook: Could not locate opf file: u'/private/var/folders/jv/z9ntx89x53lbh83qw3qy410r0000gn/T/calibre_1.13.0_tmp_cMk1T2/xPPNqg/00000-y8nSVU/OEBPS/content.opf'

This is a very simple epub created with Sigil. I cracked open the package to confirm that content.opf is in fact in the OEBPS folder (it is).

Shall I send you a copy of the file?

G