22:12:30 [SEVERE] Could not pass event AsyncPlayerChatEvent to MonsterIRC v1.73
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:479)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:461)
at net.minecraft.server.v1_4_R1.PlayerConnection.chat(PlayerConnection.j
ava:916)
at net.minecraft.server.v1_4_R1.PlayerConnection.a(PlayerConnection.java
:855)
at net.minecraft.server.v1_4_R1.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.v1_4_R1.NetworkManager.i(NetworkManager.java:208
)
at net.minecraft.server.v1_4_R1.NetworkManager.c(NetworkManager.java:344
)
at net.minecraft.server.v1_4_R1.NetworkReaderThread.run(SourceFile:93)
Caused by: java.lang.NoSuchMethodError: com.gmail.nossr50.datatypes.PlayerProfil
e.getAdminChatMode()Z
at org.monstercraft.irc.plugin.managers.listeners.MonsterIRCListener.onC
hat(MonsterIRCListener.java:62)
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.ja
va:425)
... 9 more

This should be fixed in the latest build.