Symptoms:
VMware vCenter Server Appliance 6.5.x
VMware vCenter Server Appliance 6.7.x
VMware vCenter Server 6.7.x
VMware vCenter Server 6.5.x
This issue occurs if there are any virtual machines/templates in the Inventory from 5.0 or before version without specific vim.vm.Capability property. For example "featureRequirementSupported" or "multipleCoresPerSocketSupported".
To resolve this issue: