[mbovenka]

When trying to import the Blackmask DVD (some 10.000 classics in Mobi format) Calibre 0.4.80 crashes with the following error:

C:\Program Files\calibre>calibredb add -r "z:\Blackmask DVD\mobimax"
Traceback (most recent call last):
File "cli.py", line 430, in <module>
File "cli.py", line 427, in main
File "cli.py", line 218, in command_add
File "cli.py", line 159, in do_add
File "calibre\library\database.pyo", line 1525, in recursive_import
File "calibre\library\database.pyo", line 1479, in import_book_directory_multiple
File "calibre\ebooks\metadata\meta.pyo", line 42, in metadata_from_formats
File "calibre\ebooks\metadata\meta.pyo", line 71, in get_metadata
File "C:\Program Files\calibre\library.zip\calibre\ebooks\mobi\read er.py", line 385, in get_metadata
File "C:\Program Files\calibre\library.zip\calibre\ebooks\mobi\read er.py", line 155, in __init__
File "C:\Program Files\calibre\library.zip\calibre\ebooks\mobi\read er.py", line 78, in __init__
File "struct.pyo", line 87, in unpack
struct.error: unpack requires a string argument of length 20

This is when running calibredb by hand, but the GUI pops up the same message when I do it. At first I thought it was stumbling on DRMed Mobi's (when trying it on some other ebooks), but these are all non-DRMed files.

Any idea what the problem might be?