plasma-desktop crashed with AttributeError in on_update_configuration(): 'Label' object has no attribute 'set_meter_visible'

[vongoldi]

it crash when i edit the properties from plasmoid veromix.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: plasma-desktop 4:4.8.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.94.1-0ubuntu1
Architecture: amd64
CrashCounter: 1
Date: Thu Mar 8 00:31:13 2012
ExecutablePath: /usr/bin/plasma-desktop
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120228.1)
ProcCmdline: /usr/bin/plasma-desktop
ProcEnviron:
 LANGUAGE=de_DE
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: kde-workspace
Title: plasma-desktop crashed with AttributeError in on_update_configuration(): 'Label' object has no attribute 'set_meter_visible'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionErrors: GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed