Problem with dselect

["Gudjon I. Gudjonsson" <gudjon@mc2.chalmers.se>]

Hi 
   When I update the package list wit dselect I get the following error 
message:
Fetched 1B in 5s (0B/s)
Reading package lists... Done
Merging available information
Replacing available packages info, using /var/cache/apt/available.
dpkg: parse error, in file `/var/cache/apt/available' near line 108494 package 
`beep-media-player':
 too few values in file details field `Size' (compared to others)

update available list script returned error exit status 2.
Press <enter> to continue.

This is only a problem in amd64. I tried to copy /var/cache/apt/available 
to  /var/lib/dpkg/available and edit it by hand. Then I had problem with some 
other packages but at last it worked. Therefore I guess it is a problem with 
dselect, not with the corresponding packages.
   Does anyone get the same error?

Thanks
Gudjon