Can't log into XFCE4 Session

When i try to login nothing happends and the seat0-greeter.log says:
"..glib/glib/giounix.c:412Error while getting flags for FD: Bad file descriptor (9)"
"Invalid file descriport"
"lightdm_greeter_ensure_shared_data_dir_sync: assertion 'priv->connected' failed
file:///usr/share/lightdm-webkit/themes/glorious/js/authenticate.js:167:15: CONSOLE LOG Start authentication"