Prop Hunt and Fretta HELP

I have just installed Prop Hunt onto my server and I am having problems with fretta. I wanted to stop the game mode voting so I added “fretta_voting 0” to the server config but this has not worked. When the voting for a gamemode comes up it displays nothing and them the game just crashes. How do I add a game mode to the list?

Where did you get the fretta base? :o

This was the link I got it from. I just extracted the file and installed it on the server.