Error: "A problem occurred when retrieving information for the virtual machine or snapshot. Verify that the connection to your hypervisor is working correctly. Then, close and restart the wizard. When trying to create a new machine catalog with MCS,

DesktopStudio_ErrorId : UnknownError
 

1. Validate the issue is not with the host connection by creating a new one. If the new connection works without any issues, issue is with the master image itself.
2. Create a new snapshot on the master image.
3. Update the existing catalog with that snapshot.
4. Create a new catalog with the snapshot.

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Problem Cause

The snapshot was probably broken as the error message was pointing to a null value in the hypconnection command:

Get-HypConfigurationObjectForItem  -AdminAddress "amaddc02.fbswcorp.com:80" -LiteralPath "XDHyp:\HostingUnits\xendesktop01\win7GoldMCS.vm\Win7MCS.snapshot\Win7MCSv001.snapshot\Win7MCSv002.snapshot\Win7MCSv003.snapshot"
    Get-HypConfigurationObjectForItem : An exception occurred.  The associated message was Value cannot be null.