pb with automatic update installed package

Baudouin Claude <[email protected]> Wed, 17 Dec 2003 23:31:37 +0100
Newsgroups gmane.emacs.xemacs.mule
Message-ID <[email protected]>
help gourous!

During automatic update installed package I get the next message :"couldn't 
find package preview with version nil"  and stop loading. what means this 
message? only a part of packages has been update. 
I work with xemacs 21.4.12.
Thank
Claude