pm wpmenu is a command to invoke a Waypoint Editor with its own menu. Waypoint Editor is used to create waypoints (not to control/manage bots on the server) and it can be used ONLY on a listenserver (so You are getting the right answer from the console). When You are creating a game from the steam menu, then You are playing on this PC and other players can connect to Your PC to play with You - that's the listenserver. But then - when You use the "quit" command on that server (listenserver) - it stops the work and other clients are getting also disconnected. If You are creating a dedicated server (just the game console), then - no matter if You are playing there or not - other players can connect there and then they can play.
I believe - to control bots You wanted to use the command called
pb menu
About that I have described more detailed in
that topic - so please, read carefully the whole topic (3 times) before You start asking again about something what was already answered couple of times.