Error Message:

The command finished; the name has active sessions and is no longer registered.

Explanation:

The application tried to delete a NetBIOS name, but the computer using that name is using connections to remote resources at this time. When it has finished using those resources it will be disconnected from them, and the NetBIOS name will then be deleted from the list of active NetBIOS names on this network.

User Action:

No user action is needed.