[14:16:31 ERROR]: Could not pass event AsyncPlayerChatEvent to DardChat v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:74) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:499) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.chat(PlayerConnection.java:1111) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1026) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat$1.run(PacketPlayInChat.java:39) [patched.jar:git-PaperSpigot-"4c7641d"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_60]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_60]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_60]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_60]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_60]
Caused by: java.lang.IllegalArgumentException: Illegal group reference: group index is missing
        at java.util.regex.Matcher.appendReplacement(Matcher.java:819) ~[?:1.8.0_60]
        at java.util.regex.Matcher.replaceAll(Matcher.java:955) ~[?:1.8.0_60]
        at java.lang.String.replaceAll(String.java:2223) ~[?:1.8.0_60]
        at al.egin.dardchat.config.DardAdvertPlayersConfig.warnPlayer(DardAdvertPlayersConfig.java:71) ~[?:?]
        at al.egin.dardchat.listeners.DardChatListener.onChat(DardChatListener.java:64) ~[?:?]
        at al.egin.dardchat.listeners.priorities.LOWEST.onPlayerChat(LOWEST.java:15) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor377.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_60]
        at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_60]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        ... 12 more