Online mode can be set within VotingPlugin via this setting:
OnlineMode: true
If your using mixed uuids (online/offline or premium/cracked) then it may work better to disable OnlineMode. VotingPlugin will simply get the uuid based on the player name, essentially ensuring uuids will always be the same.
Online mode can be set within VotingPlugin via this setting:
OnlineMode: true
Only disable this setting if you know for a fact your using offline uuids exclusively.
In the event of using mixed uuids (Premium and cracked players) leave enabled and disable UUIDLookup on proxy
If you are unsure of this setting, leave it enabled.