error3

2013-09-08 21:52:17 [INFO] [AuthMe] minecrafter02 logged in!
2013-09-08 21:52:20 [SEVERE] Could not pass event PlayerInteractEntityEvent to myRPG v2.0  [1082]
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
    at us.Myles.PWP.FakePluginManager.fireEvent(FakePluginManager.java:101)
    at us.Myles.PWP.FakePluginManager.callEvent(FakePluginManager.java:87)
    at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:1107)
    at net.minecraft.server.v1_6_R2.Packet7UseEntity.handle(SourceFile:36)
    at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
    at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:116)
    at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
    at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
    at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:592)
    at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:239)
    at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:481)
    at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:413)
    at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.NullPointerException
    at com.sharesc.caliog.myNPC.myNPCListener.playerRightClicked(myNPCListener.java:80)
    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:606)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 15 more