[16:46:00 INFO]: Maxincredible52 issued server command: /chatmanager
[16:46:00 ERROR]: Could not pass event PlayerCommandPreprocessEvent to ChatManager v7.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.PlayerConnection.handleCommand(PlayerConnection.java:1334) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.PlayerConnection.a(PlayerConnection.java:1177) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_74]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_74]
        at net.minecraft.server.v1_9_R1.SystemUtils.a(SourceFile:45) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.MinecraftServer.D(MinecraftServer.java:721) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.MinecraftServer.C(MinecraftServer.java:660) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at net.minecraft.server.v1_9_R1.MinecraftServer.run(MinecraftServer.java:559) [spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]
Caused by: java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()[Lorg/bukkit/entity/Player;
        at me.Flintbeker.Chatmanger.Main.onCommand(Main.java:396) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_74]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_74]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_74]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_74]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.9.jar:git-Spigot-b1c1b55-dd016e7]
        ... 16 more