Bukkit

[23:15:46] [Craft Scheduler Thread - 50/WARN]: [GAListener] Plugin GAListener v1.3.2 generated an exception while executing task 46
java.lang.NoSuchMethodError: org.bukkit.Server._INVALID_getOnlinePlayers()[Lorg/bukkit/entity/Player;
at com.swifteh.GAL.Metrics.postPlugin(Metrics.java:335) ~[?:?]
at com.swifteh.GAL.Metrics.access$4(Metrics.java:328) ~[?:?]
at com.swifteh.GAL.Metrics$1.run(Metrics.java:223) ~[?:?]
at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftTask.run(CraftTask.java:81) ~[spigot.jar:git-Spigot-9de398a-9c887d4]
at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54) [spigot.jar:git-Spigot-9de398a-9c887d4]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_231]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_231]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]

Not sure what any of this means but it keeps repeating and where it says [... 50/WARN] that number keeps going up but it always says its task 46...