Quartus II 9.1 sp2 Free error while trying to run in Linux

Hello everybody, first of all thanks in advance for your comments. I'm running Fedora 11 i686 and Im trying to run Quartus II 9.1 sp2 free version. I already install it with any problem but when I run ./quartus immediately I got the following error =>

Qt: Session management error: None of the authentication protocols specified are supported

Internal Error: Sub-system: QUI, File: /quartus/sys/qui/qui_app.cpp, Line: 505