[apport] software-properties-gtk crashed with ImportError in <module>()

i don't know what's going on anymore :\

ProblemType: Crash
Date: Mon Feb 26 23:39:53 2007
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/software-properties-gtk
InterpreterPath: /usr/bin/python2.5
Package: software-properties-gtk 0.56
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 48234533
ProcCwd: /home/rmf
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
 LANG=C
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '48234533']
SourcePackage: software-properties
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/software-properties-gtk", line 39, in <module>
     import aptsources
 ImportError: No module named aptsources
Uname: Linux computador 2.6.20-8-generic #2 SMP Tue Feb 13 05:18:42 UTC 2007 i686 GNU/Linux