pidgin crashed with ValueError: bad marshal data (unknown type code)

I have no other thing to add. simply i pidgin in autostart, and he refuse to start.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: pidgin 1:2.10.6-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-8.8-generic 3.5.0
Uname: Linux 3.5.0-8-generic x86_64
ApportVersion: 2.4-0ubuntu6
Architecture: amd64
Date: Fri Aug 10 11:15:58 2012
ExecutablePath: /usr/bin/pidgin
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcCmdline: pidgin
ProcEnviron:
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: pidgin
Title: pidgin crashed with ValueError: bad marshal data (unknown type code)
Traceback: ValueError: bad marshal data (unknown type code)
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo