Bukkit

When someone puts their name into a voting site that is working and has been tested, this plugin does work. I have done /fakevote and nothing HAS popped up in the chat!!! Everything else works fine but that. HELP

[01:53:20 INFO]: [Votifier] Received vote record -> Vote (from:TopG.org username:wildcam_ address:107.5.32.216 timeStamp:1504936678) [01:53:20 INFO]: [GAListener] Vote received on TopG.org for Player: WildCam_ [01:53:20 WARN]: Exception in thread "Craft Scheduler Thread - 273" [01:53:20 WARN]: org.apache.commons.lang.UnhandledException: Plugin GAListener v1.3.2 generated an exception while executing task 26088 at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: 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_8_R3.scheduler.CraftTask.run(CraftTask.java:71) at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53) ... 3 more