Map selection won't show up

I was playing gmod and then it started freezing, i restarted and when it started up there was a large grey box covering the the background. ignoring it, i went to play single player and the map selection screen didn’t show up, i also tried create multiplayer, same thing happened. is there anyway i can fix this?

also i found console errors relating to it:

Lua: menu/singleplayer.lua:65: attempt to index field ‘StartGame’ (a nil value)
Lua: menu/multiplayer.lua:63: attempt to index field ‘MapSheet’ (a nil value)
Lua: menu/singleplayer.lua:65: attempt to index field ‘StartGame’ (a nil value)
Lua: menu/multiplayer.lua:63: attempt to index field ‘MapSheet’ (a nil value)
Unknown command “menu_singleplayer”
Unknown command “menu_multiplayer”

Edit:
Problem solved. just had to reinstall and restart my computer