Voter Not working

Title basically says it guys.


For some reason, I am getting this notifcation. I have asked players about it also, thinking it was because they may have already voted but that is not the case. 

Any ideas what it could be? 

Same issue!!

I'm getting the unknown command  which there aren't any perms to allow 

Just tried to use this and getting the same error message as well, any updates or fixes for this?