xsession errors

/etc/mdm/Xsession: Beginning session setup...
/etc/mdm/Xsession: Setup done, will execute: /usr/bin/ssh-agent -- startxfce4
/usr/bin/startxfce4: X server already running on display :0
xrdb:  "Xft.hinting" on line 10 overrides entry on line 6
xrdb:  "Xft.hintstyle" on line 13 overrides entry on line 7
xfce4-session: error while loading shared libraries: libxfce4util.so.6: cannot open shared object file: No such file or directory