No map vote screen after matches (prop hunt)

When the match ends in prop hunt, it should show the screen where everyone votes on a map. This doesn’t come up for me and I get errors. I’ve tried the !mapvote command and I get this error

[MapVote] lua/mapvote/cl_mapvote.lua:47: attempt to call method 'SetMaps' (a nil value)
  1. func - lua/mapvote/cl_mapvote.lua:47
   2. unknown - lua/includes/extensions/net.lua:32

I have ULX and XGUI but cant figure out how to get a map voting system working??