Problem: VMware Horizon View
Server Error - Unknown.
Error getting snapshot information for the machine with ID.
Error during provisioning: View Composer Fault: Unexpected VC fault from View Composer (Unknown) - Unknown -
Upon checking the VM in vCenter Server the path matches and snapshots are there.
Solution: Create a new snapshot, delete it and problem is fixed. You can enable provisioning on the pool and edit the pool without any errors.