[desertblues]

Since about a week Calibre does recognize iBooks, but stopped sending books. When trying to send it give the errormessage:
----
Command failed:
OSERROR: -50
MESSAGE: Parameter error.
COMMAND: app(u'/Applications/iTunes.app').sources.ID(47664).library_playlists.I D(54094).file_tracks.ID(61867).name.set(u"A Writer's People")

Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 85, in run
File "site-packages/calibre/gui2/device.py", line 561, in _upload_books
File "site-packages/calibre/devices/apple/driver.py", line 1185, in upload_books
File "site-packages/calibre/devices/apple/driver.py", line 3036, in _update_iTunes_metadata
File "site-packages/appscript/reference.py", line 498, in __call__
CommandError: Command failed:
OSERROR: -50
MESSAGE: Parameter error.
COMMAND: app(u'/Applications/iTunes.app').sources.ID(47664).library_playlists.I D(54094).file_tracks.ID(61867).name.set(u"A Writer's People")
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I'm running version 1.7.0 of Calibre and installed the latest version of the iOs reader applications 1.2.1. This plugin installs twice, for some reason, but I configured both. (if I delete one, they both disappear).

I can add books in iBooks by sending the epub to desktop, dragging them into iTunes and synchronize, but Calibre used to do it directly. So; it is not a huge problem but one I would like to resolve.
I would appreaciate any suggestions.

edit: I'm using the iPad1 and iTunes 5.1.1.