Bukkit

What steps will reproduce the problem?
1.Normal execution as usual
2.
3.

What is the expected output? What do you see instead?
errors in consol

What version of the product are you using?
4

Do you have an error log of what happened?

Please provide any additional information below.
10:40:40 [WARNING] [TexturePackChanger] Task #1878781 for TexturePackChanger v4.0 generated an exception
java.lang.NullPointerException
        at me.jtjj222.texturepackchanger.TexturePackChanger.changeTexturePack(TexturePackChanger.java:124)
        at me.jtjj222.texturepackchanger.TexturePackChanger$1.run(TexturePackChanger.java:94)
        at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftTask.run(CraftTask.java:53)
        at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
        at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:512)
        at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
        at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476)
        at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409)
        at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)

This server is running CraftBukkit version git-Bukkit-1.5.1-R0.2-5-g7fd3e34-b2758jnks (MC: 1.5.1) (Implementing API version 1.5.1-R0.3-SNAPSHOT)

BTW. i got updated java (lastet V 7), last night, ans the errors has been her since then.