Device already present in the System

Device already present in the System

I have some problems with adding a vmhost after I deleted it. I get the message: "Device already present in the System", but when I search for it as a host or ip I get no results. The reason I deleted the vmhost was that it could not figure out how to display the current VMs after some of them have migrated to another host. I am running MS HyperV cluster with four nodes. I am running OpManager 10100

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