Hyper-V: The operation cannot be performed while the object is in its current state.

Just got an interesting error while building a machine in Hyper-V.  I was starting it for the first time and got this error message.

Hyper-V: The operation cannot be performed while the object is in its current state.

The reason being that I’d attached a single physical DVD drive to both the new VM and to another Virtual machine.  I disconnected the physical drive from the other VM and the faulty VM started up fine.