i have a Centos server that install Xen and hypervm in it.
i have some vps in this server.
i restart server and after that i get this eror for run vps :
Could Not Start Vps, Reason: Error: Device 0 (vif) could not be connected. Could not find bridge, and none was specified:

how can i solved this problem ?

my server is : Centos5.2
please help me