After setting up XenDesktop 5.6 with my vSphere 5.0 environment, I received the below error message when trying to create my first catalog.
ESXi 5.0, vSphere 5.0
The Catalog has the following errors:
Failed to create the virtual machine; DOMAIN\ComputerName$; Value cannot be null.
Parameter name: source
Proper XenDesktop permissions where not applied at the DataCenter level in vCenter.