Bukkit

What steps will reproduce the problem?
1. When breaking a block
2.
3.

What is the expected output? What do you see instead?
To hopefully get no errors. But I get this Error.
[code] 10:03:49 [SEVERE] Could not pass event BlockPlaceEvent to SwornJail v2.3 org.bukkit.event.EventException at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341) 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 org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:99) at net.minecraft.server.ItemBlock.interactWith(ItemBlock.java:76) at net.minecraft.server.ItemStack.placeItem(ItemStack.java:87) at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.java:382) at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:650) at net.minecraft.server.Packet15Place.handle(SourceFile:58) at net.minecraft.server.NetworkManager.b(NetworkManager.java:282) at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:111) at net.minecraft.server.ServerConnection.b(SourceFile:35) at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30) at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:578) at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:215) at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:495) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:428) at net.minecraft.server.ThreadServerApplication.run(SourceFile:818) Caused by: java.lang.NullPointerException at com.minesworn.swornjail.Jail.isInside(Jail.java:64) at com.minesworn.swornjail.listeners.BlockListener.canPlayerBuildHere(BlockListener.java:36) at com.minesworn.swornjail.listeners.BlockListener.onBlockPlace(BlockListener.java:19) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:339) ... 18 more [/code]

What version of the product are you using? Which version of Java are you running and which version of craftbukkit?
Lastest version on SowrnJail and Bukkit 1.4.2R0.2

Do you have an error log of what happened?
See above

Please provide any additional information below.
To get this fixed?