Linksys SRW224G4

Linksys SRW224G4

Dear Support,
I installed Opmanager 7100, added switches and routers in my network. All the progress is okey but in Linksys SRW224G4 series switches i cannot measure the traffic of interfaces. I get this error on graph "Sorry, no data available for Graph. Try other options".
Checked credidants, SNMP is ok. I have spend 2 days reading forums if same thing occured before. Couldnt find a solution. I got 3 Linksys SRW224G4 series switches in my network, so i dont want to change the switches.
Urgently need support, cannot use Opmanager before all network has been implemented to monitoring.
Thanks.