'pidgin' received an X Window System error.

Binary package hint: pidgin

When I'm starting pidgin, I recieve the following error wich closes the application.
This happens since I've upgraded to kde4 using the help from kubuntu.org.
---------------------------------------
$ pidgin
The program 'pidgin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 480 error_code 8 request_code 2 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

------------------------------
Any thoughts?

ProblemType: Bug
Architecture: i386
Date: Mon Jan 14 22:21:36 2008
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/pidgin
NonfreeKernelModules: nvidia
Package: pidgin 1:2.2.1-1ubuntu4.1
PackageArchitecture: i386
ProcCmdline: pidgin
ProcCwd: /home/tassly
ProcEnviron:
 SHELL=/bin/bash
 PATH=/usr/lib/kde4/bin:/usr/lib/kde4/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 LANGUAGE=
SourcePackage: pidgin
Uname: Linux SLEEPER 2.6.22-14-generic #1 SMP Tue Dec 18 08:02:57 UTC 2007 i686 GNU/Linux