[16:00:15] [Async Chat Thread - #0/ERROR]: Could not pass event AsyncPlayerChatEvent to ButterChatFormat v0.0.1
org.bukkit.event.EventException: null
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:74) ~[NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:490) [NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:472) [NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at net.minecraft.server.v1_8_R3.PlayerConnection.chat(PlayerConnection.java:1284) [NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1199) [NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat$1.run(PacketPlayInChat.java:49) [NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) [?:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) [?:?]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) [?:?]
    at java.lang.Thread.run(Thread.java:833) [?:?]
Caused by: java.util.UnknownFormatConversionException: Conversion = '%'
    at org.bukkit.event.player.AsyncPlayerChatEvent.setFormat(AsyncPlayerChatEvent.java:100) ~[NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    at net.zdany.butterchatformat.ChatEvent.onChat(ChatEvent.java:18) ~[?:?]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[NachoSpigot.jar:git-NachoSpigot-"9c02430"]
    ... 12 more