Error while installing unstable/binary/base/at_3.0.deb

[Andreas Tille <e2od5@mlucom.urz.uni-halle.de>]

While doing

   dpkg -i at_3.0.deb

I got the following errormessage.
The at_2.9b??.deb in stable works.

(Reading database ... 21163 files and directories currently installed.)
Preparing to replace at 3.0 (using at_3.0.deb) ...
Unpacking replacement at ...
/var/lib/dpkg/info/at.postrm: spool}: command not found
dpkg: warning - old post-removal script returned error exit status 127
dpkg - trying script from the new package instead ...
/var/lib/dpkg/tmp.ci/postrm: spool}: command not found
dpkg: error processing at_3.0.deb (--install):
 subprocess new post-removal script returned error exit status 127
/var/lib/dpkg/tmp.ci/postrm: spool}: command not found
dpkg: error while cleaning up:
 subprocess post-removal script returned error exit status 127
Errors were encountered while processing:
 at_3.0.deb

Is there anybody who observed the same or should I send a bug report
(or are there any developers reading this and take it as a bug report
and I havn't to send this twice)

Andreas.