package nanny 2.31.1-0ubuntu4 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1

I tried to uninstall this application because I couldn't get it to work. When I opened the configuration window, all appeared OK, but if I take the mouse focus away from it, the window no longer functions when focus is returned. I performed a re-install with synaptic, but this did not fix theproblem. I now can't uninstall it either!

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: nanny 2.31.1-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic i686
AptOrdering: nanny: Purge
Architecture: i386
Date: Mon Aug 22 10:51:45 2011
DpkgTerminalLog:
 Removing nanny ...
 Stopping nanny (Parental Control Daemon): start-stop-daemon: warning: failed to kill 6002: No such process
 invoke-rc.d: initscript nanny, action "stop" failed.
 dpkg: error processing nanny (--purge):
  subprocess installed pre-removal script returned error exit status 1
ErrorMessage: subprocess installed pre-removal script returned error exit status 1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: nanny
Title: package nanny 2.31.1-0ubuntu4 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)