Bukkit

I am running NUVotifer along with GAListener.

This is the error we cann't wrap our heads around it

13:45:18 ERROR]: [Votifier] Unable to process vote from /149.202.74.183:54154
[13:45:29 ERROR]: [Votifier] Unable to process vote from /198.27.83.157:50955
[13:45:37 ERROR]: [Votifier] Unable to process vote from /104.131.162.253:59599
[13:45:44 INFO]: [GAListener] Vote received on Minecraft-Tracker.com for Player: SilverBloodYT
[13:45:44 WARN]: [GAListener] Plugin GAListener v1.3.2 generated an exception while executing task 272
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_13_R1.scheduler.CraftTask.run(CraftTask.java:76) ~[spigot-1.13.jar:git-Spigot-1503de9-53d3ac0]
at org.bukkit.craftbukkit.v1_13_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) [spigot-1.13.jar:git-Spigot-1503de9-53d3ac0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_161]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_161]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]