unknown command

i don’t know whats going on with garry’s mod it must of been a update or something but it won’t let me play multiplayer/single player/extentions i looked at consoles and it said

Unknown command “menu_achievements”
Unknown command “menu_extensions”
Unknown command “menu_singleplayer”
Unknown command “menu_multiplayer”

plz help me i looked at others peoples threads did some of the stuff they said and still nothing…
also i have halflife 2 and halflife lost coast


Help and support forum is above this one, for future reference.

thanks i followed you instructions and it worked =)
everything expect mulitplayer

i need help, i need a couple of ragdolls made from art work done by my sister. i’ll make sure that the art work will be as clear as posible. if any one is intrested please e-mail at tripprules@yahoo.com.