vnc install problem

dear
i install vnc server and gui in centos server , but i have a problem , when i connect to gui via vnc client , I see a window with out anything that have a brown color and have just mouse.
i install vnc server from below link :

HTML Code:

http://wiki.centos.org/HowTos/VNC-Server

please see the attach file and help me for solved this problem.
I want to create a windows vps in Xen server via vnc.
thanks a lot