When player joins server, locale error occurs#427

Console11:44:46 org.bukkit.event.EventException: null at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-PaperSpigot-"e6e02685"] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[server.jar:git-PaperSpigot-"e6e02685"] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-PaperSpigot-"e6e02685"] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) ~[server.jar:git-PaperSpigot-"e6e02685"] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) ~[server.jar:git-PaperSpigot-"e6e02685"] at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerLocaleChangeEvent(CraftEventFactory.java:978) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.EntityPlayer.a(EntityPlayer.java:1036) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1981) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.PacketPlayInSettings.a(SourceFile:52) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.PacketPlayInSettings.a(SourceFile:9) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) ~[server.jar:git-PaperSpigot-"e6e02685"] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?] at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?] at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:914) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:371) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:849) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:685) ~[server.jar:git-PaperSpigot-"e6e02685"] at net.minecraft.server.v1_8_R3.MinecraftServer.lambda$spin$0(MinecraftServer.java:136) ~[server.jar:git-PaperSpigot-"e6e02685"] at java.lang.Thread.run(Thread.java:829) ~[?:?] Caused by: java.lang.NoSuchMethodError: 'java.lang.String org.bukkit.event.player.PlayerLocaleChangeEvent.getLocale()' at co.aikar.commands.ACFBukkitLocalesListener.onLocaleChange(ACFBukkitLocalesListener.java:51) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?] at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[server.jar:git-PaperSpigot-"e6e02685"] ... 19 more