The good news is that I got the voting plugin to work. The bad news is that the map is really hosed. I'm waiting to get the spawn from the admins that put a lot of time into it. I will see if I can repair this world and insert it in. But worst case we may have to do a brand new map.
Until you hear back please change your client to 1.11.2 and use prism.ccgr.org