Problem/Bug GAListener doesnt seem to be working

[01:09:38] [Server thread/INFO]: [GAListener] Vote received on planetminecraft|12 for Player: Opticthief
[01:09:38] [Server thread/INFO]: sent fake vote![m
[01:09:38] [Server thread/INFO]: [GAListener] Sent fake vote: Vote (fromlanetminecraft|12 username:Opticthief address:fakeVote.local timeStamp:1513901378703)
[01:09:38] [pool-3-thread-1/WARN]: [GAListener] Plugin GAListener v1.3.2 generated an exception while executing task 83
java.lang.NoSuchMethodError: org.bukkit.Server._INVALID_getOnlinePlayers()[Lorg/bukkit/entity/Player;
at com.swifteh.GAL.RewardTask.run(RewardTask.java:37) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit.jar:git-Bukkit-94b0980]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) [craftbukkit.jar:git-Bukkit-94b0980]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_91]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]

I have come across this in my web console while setting up mods, no broadcast is shown and no rewards are given however the vote still tallies up the total.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@Opticthief
GAListener has not been working for a while. It has not been updated since 1.8. You should either find a continuation of the plugin (where someone else develops it) or find another plugin entirely.