AttributeError: 'WinServiceSNMPDevice' object has no attribute 'deviceClass'

I am using zenoss core 3 running on RHEL 5.4 and after adding some devices, I noticed that reports are no longer loading and zenoss is not monitoring anymore. Troubleshooting on the on the server zenping, zencommand, zenstatus, zensla and zenperfsnmp daemons are not running and starting them individaully did not work. I have restarted both zenoss and the server severally but the problem persists.

When I ran zenchkrels -r -x1 command, i got the following error message:

Traceback (most recent call last):
File "/opt/zenoss/Products/ZenUtils/CheckRelations.py", line 72, in
tmbk.rebuild()
File "/opt/zenoss/Products/ZenUtils/CheckRelations.py", line 40, in rebuild
object.checkRelations(repair=repair)
File "/opt/zenoss/Products/ZenRelations/RelationshipManager.py", line 262, in checkRelations
rel.checkRelation(repair)
File "/opt/zenoss/Products/ZenRelations/ToManyContRelationship.py", line 311, in checkRelation
rrel = getattr(obj, remoteName)
AttributeError: 'WinServiceSNMPDevice' object has no attribute 'deviceClass'

Apparently a device doesnt have a device class. Degugging the failed daemons also give similar error. Is there any way to remove the device entry causing this problem Please I need your help to resolve this issue.

Thanks