apt-get error

[Nikhil Prabhakar <nipraonline@gmail.com>]

Hi,
 I'm getting following errors after "apt-get upgrade".I'm using Sarge
3.1 and tried to upgrade after adding testing & unstable repositories
to my source.lst file.All packages were successfully downloaded.
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Preparing to replace kdemultimedia-kio-plugins 4:3.3.2-1 (using
.../kdemultimedia-kio-plugins_4%3a3.5.0-3_i386.deb) ...
Unpacking replacement kdemultimedia-kio-plugins ...
dpkg: error processing
/var/cache/apt/archives/kdemultimedia-kio-plugins_4%3a3.5.0-3_i386.deb
(--unpack):
 trying to overwrite
`/usr/share/doc/kde/HTML/en/kioslave/audiocd.docbook', which is also
in package kdebase-kio-plugins
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/kdemultimedia-kio-plugins_4%3a3.5.0-3_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
-------------------------------------------------------------------------------------------------------------------------------------

Thanks in advance.

Regards
Nikhil Prabhakar