This is the vCenter-side error code returned the last time this specific deletion task issued its remove-DVS call. Since deleting an in-use DVS can be legitimately rejected by vCenter, e.g. VMs still attached to its port groups, this error code on this task is the first place to look to distinguish 'vCenter refused the deletion' from a UCS Manager-side connectivity problem. A code corresponding to 'resource in use' here would mean vCenter is refusing to delete this specific DVS because it still has active port group members.