factions error

2012-08-10 21:31:41 [SEVERE] Could not pass event AsyncPlayerChatEvent to Factions
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:332)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:830)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:807)
	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
	at net.minecraft.server.NetworkManager.i(NetworkManager.java:216)
	at net.minecraft.server.NetworkManager.c(NetworkManager.java:331)
	at net.minecraft.server.NetworkReaderThread.run(SourceFile:93)
Caused by: java.util.MissingFormatArgumentException: Format specifier 's'
	at java.util.Formatter.format(Unknown Source)
	at java.util.Formatter.format(Unknown Source)
	at java.lang.String.format(Unknown Source)
	at com.massivecraft.factions.FPlayer.getChatTag(FPlayer.java:377)
	at com.massivecraft.factions.listeners.FactionsChatListener.onPlayerChat(FactionsChatListener.java:146)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
	... 9 more