Remote Desktop Virtualization Host could not disconnect the virtual disk named %1 from the virtual desktop named %2 while ...

Remote Desktop Virtualization Host could not disconnect the virtual disk named %1 from the virtual desktop named %2 while running a provisioning request for the shared virtual desktop collection named %3. 

Virtual disk name: %1
Virtual desktop name: %2
Shared virtual desktop collection name: %3
Hresult: %4