no rrd file in rra directory for new interface

[bumba]

I have problem when create new graph for all interface in router. The add new host process in cacti already success, but not generate graph if i select one of interface in new host. I install cacti 0.8.5.a,php version 4.3.6 and wincron 4.3.1 for scheduling. The existing monitoring to existing router with cacti running well (shown graph). Does any one know,how to fix my problem?

regards,


Bumba