unable to delete a device

I am unable to delete a device. I keep getting the POSkey error for this device on the UI.
i tried using the zenoss toolbox and running the findposkeyerror script which couldnt fix the issue.
I tried various suggestions getting in to the zendmd to delete the device. All of my efforts have seem to have failed.
running the reindex on zendmd gives me this output.
> reindex()
Traceback (most recent call last):
File "", line 1, in
File "/opt/zenoss/Products/ZenModel/zendmd.py", line 142, in reindex
dmd.Devices.reIndex()
File "/opt/zenoss/Products/ZenModel/DeviceClass.py", line 807, in reIndex
dev._create_componentSearch()
File "/opt/zenoss/Products/ZenModel/Device.py", line 559, in _create_componentSearch
for c in self.getDeviceComponentsNoIndexGen():
File "/opt/zenoss/Products/ZenModel/Device.py", line 602, in getDeviceComponentsNoIndexGen
for rel in baseObject.getRelationships():
AttributeError: 'str' object has no attribute 'getRelationships'

I need some help in deleting this device. I would appreciate any suggestions on this.

Thanks,