When I try to install something, it says "An unhandlable Error occured."

[Akshit Ceaze]

Binary package hint: software-center

I am using Ubuntu 10.10.

When I try to install anything from the Ubuntu Software Center, it says that:
"An Unhandlable error occured
There seems to be a programming error in aptdaemon, the software that allows you to install/remove software and to perform other package management related tasks. Please report this error at http://launchpad.net/aptdaemon/+filebug and retry."

and when I click on "Details", it shows
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 936, in _simulate_helper
    return depends, status, self._cache.required_download, \
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 218, in required_download
    pm.get_archives(fetcher, self._list, self._records)
SystemError: E:I wasn't able to locate file for the gstreamer0.10-fluendo-plugins-mp3-partner package. This might mean you need to manually fix this package.

How can I Fix this error, and download Softwares??

I have added a Screenshot of the Error.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: software-center 3.0.4
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Sat Dec 18 17:16:46 2010
LiveMediaBuild: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: software-center