Intenral server error while vizualizing 101-simple-windows-vm Azure Stack quick start template

For **Azure Stack** quick start template [101-simple-windows-vm](https://raw.githubusercontent.com/Azure/AzureStack-QuickStart-Templates/master/101-simple-windows-vm/azuredeploy.json), the **Portal UI Editor** succeeds for **Validate** but errors out for **Preview**: _The page cannot be displayed because an internal server error has occur_
