kopete icq does not work

When I want to login into icq, it does not work. "Unbekannter Fehler" / unknown error.

I checked number and password with icq go, they are correct, but I cannot log in.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: kopete 4:4.7.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Mon Nov 7 11:21:46 2011
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 LANGUAGE=
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: kdenetwork
UpgradeStatus: No upgrade log present (probably fresh install)