RecipeManager error

2012-07-31 21:51:53 [INFO] [RecipeManager]  [31;1mCraftItemEvent cancelled due to error: [m
2012-07-31 21:51:53 [SEVERE] java.lang.NullPointerException
2012-07-31 21:51:53 [SEVERE]    at digi.recipeManager.Events.eventCraft(Events.java:524)
2012-07-31 21:51:53 [SEVERE]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2012-07-31 21:51:53 [SEVERE]    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2012-07-31 21:51:53 [SEVERE]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2012-07-31 21:51:53 [SEVERE]    at java.lang.reflect.Method.invoke(Unknown Source)
2012-07-31 21:51:53 [SEVERE]    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)
2012-07-31 21:51:53 [SEVERE]    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
2012-07-31 21:51:53 [SEVERE]    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
2012-07-31 21:51:53 [SEVERE]    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:1062)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.Packet102WindowClick.handle(SourceFile:28)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.NetworkManager.b(NetworkManager.java:246)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:102)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:82)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:559)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:451)
2012-07-31 21:51:53 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)