Uninstall vShield Edge 5.1

Hello,

I am unable to delete a vshield edge applicance from my virtual datacenter. I followed the steps mentioned in the quick start guide and its gives me the following error

faultCode:FAILED_TO_DELETE_EDGE_APPLIANCE_ERROR faultString:'Failed to delete edge appliance.' faultDetail:'null'

Please help.

Thanks and Regards,

Rupesh