Op Manager 7 / Cisco Catalyst Alarm problem

I am getting the following alarm on Op Manager 7 relating to errors on a Cisco port:

-- Errors rate for Port GigabitEthernet6/40 is 4.042%, threshold value for this monitor is 1% --

When I try to clear the alarm, I get the following error:

-- webclient.fault.alarm.clear.status.failure --

When I try to delete the alarm, I get the following error:

-- Problem in deleting alarm! --

This is a big problem, because I am unable to clear the "Trouble" status for this switch, therefore I cannot use a Notification profile because I will get emailed all the time with a 'false' Trouble alarm. This is happening on both of my Cisco backbone chassis switches, and I am unable to monitor them as a result.

Any help with this issue is greatly appreciated!

Thanks.