Unable to add VM's to inventory

Hi there

We have a bit of a nasty ones on our hands. We have two Virtual Machines that was removed from Vcenter inventory. When we browse to the datastore and right click to add to inventory the option is grayed out.

VCenter version 5.0.0

ESXi hosts version 5.0.0 721882

We did a vmkfstools -D on the vmx and vmdk files to see if anything has a lock. The return yielded that a specific host has locks on the vmk and vmdk files. After research we restarted the management agents on the host that issued the lock. Yet we are still unable to add to the inventory.

We then SSH'd to the host and did a manual registration via vim-cmd solo/registervm but all we get is:

(vim.fault.InvalidDatastorePath) {
   dynamicType = <unset>,
   faultCause = (vmodl.MethodFault) null,
   datastore = <unset>,
   name = "",

Any assistance would be appreciated