"An Unhandleable Error Occured" during GNU Solfege install

[Brennan Conroy]

Error message:
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.

Details:
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 kdepim-wizards package. This might mean you need to manually fix this package.

[Brennan Conroy (brennan-conroy840)]

Following the instruction to retry installed the software, fine. Not sure what caused this error; sorry if I reported a routine thing, I'm fairly new to the Ubuntu thing.