An administratorhas logged into his HMC via ssh and is the only person using the HMC at this moment. When trying to open a terminal session to one of his LPARs using the vtmenu command, but only…

An administratorhas logged into his HMC via ssh and is the only person using the HMC at this moment. When trying to open a terminal session to one of his LPARs using the vtmenu command, but only receives the error message: A terminal session is already open for this partition. Only one open session is allowed for a partition. Which command must be run in order to solve this problem?