Bukkit

What steps will reproduce the problem?
1.Placed it in your plugin folder running spigot 1.8.3 and essenntials
2.Start the server and join it
3.type anything in chat anc check the console.and the error appears

What is the expected output? What do you see instead?
No error should occur, but i keep seeing this
Could not pass event AsyncPlayerChatEvent to ChatTweaks v3.3.5
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at net.minecraft.server.v1_8_R2.PlayerConnection.chat(PlayerConnection.java:1055) [spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:993) [spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at net.minecraft.server.v1_8_R2.PacketPlayInChat$1.run(PacketPlayInChat.java:39) [spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_55]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_55]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_55]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_55]
    at java.lang.Thread.run(Unknown Source) [?:1.7.0_55]
Caused by: java.util.UnknownFormatConversionException: Conversion = '%'
    at org.bukkit.event.player.AsyncPlayerChatEvent.setFormat(AsyncPlayerChatEvent.java:100) ~[spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    at com.novixcraft.plugins.chattweaks.channels.ChannelManager.processChannelMessage(ChannelManager.java:43) ~[?:?]
    at com.novixcraft.plugins.chattweaks.managers.ChatManager.onPlayerChatEvent(ChatManager.java:278) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_55]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_55]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_55]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_55]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot-1.8.3.jar:git-Spigot-26dfd01-ad2f806]
    ... 11 more

What version of the product are you using?
latest chattweaks version

Do you have an error log of what happened?
Pasted it above

Please provide any additional information below.

Please provide your Configuration.yml file.
*Don't forget to use pastebin.org!