software-properties-gtk crashed with NameError in add_key_clicked()

[Dario]

it crashed while importing key from http://apt.wicd.net/wicd.gpg

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/software-properties-gtk
InterpreterPath: /usr/bin/python2.6
Package: software-properties-gtk 0.71.5
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 67108993
ProcEnviron:
 PATH=(custom, no user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '67108993']
SourcePackage: software-properties
Title: software-properties-gtk crashed with NameError in add_key_clicked()
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/python2.6/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 761, in add_key_clicked
     error(self.window_main,
 NameError: global name 'error' is not defined
Uname: Linux 2.6.28-11-generic i686
UserGroups: