7/13/2012 12:32:47 AM [SEVERE] Could not pass event PlayerQuitEvent to AntiShare
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:304)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at net.minecraft.server.ServerConfigurationManager.disconnect(ServerConfigurationManager.java:181)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:699)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:234)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:114)
at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:83)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:461)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NoClassDefFoundError: com/turt2live/antishare/inventory/ASInventory$InventoryType
at com.turt2live.antishare.inventory.InventoryManager.releasePlayer(Unknown Source)
at com.turt2live.antishare.ASListener.onQuit(Unknown Source)
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:302)

any advice?

Bukkit problem, reload.