calibredb add metadata issue

[vir_db]

Hi all,

I'm using Calibre Portable on Windows to edit some ebook, convert en the export in epub format. I don't want separate cover or metadata file, just all embedded in epub.

After the export, I move those ebooks on my linux calibre server (where the main libray stay) and add them using calibredb.

But I got this strange error:

Traceback (most recent call last):
File "site-packages/calibre/customize/ui.py", line 347, in get_file_type_metadata
File "site-packages/calibre/customize/builtins.py", line 191, in get_metadata
File "site-packages/calibre/ebooks/metadata/epub.py", line 230, in get_metadata
File "site-packages/calibre/ebooks/metadata/epub.py", line 136, in get_zip_reader
File "site-packages/calibre/utils/localunzip.py", line 234, in __init__
File "site-packages/calibre/utils/localunzip.py", line 210, in _extractall
ValueError: Not a ZIP file

The book is added as well but without cover and comments.

Doing the same process from a Linux machine where calibre is installed, the import works fine.

All Calibre programs tested are 1.45 (latest, taken from the calibre site)

Do I must do some kind of windows-to-linux conversion, before add those ebook?

thanks a lot in advandage