While Deploying Virtual Desktop Infrastructure (VDI), I'm not able to add any VM's in the Collection

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http://superuser.com – I am trying to create a Virtual Desktop collection, when ever i reach the page where it asks to select a Virtual Desktop Template it does not detect any Virtual Desktop even when I have a VM on the server and it has been sysprep'd. Is there any specific location where I should store the Virtual Desktop? can any one suggest what should I do, I have attached a picture of where I get stuck. (HowTos)