Please Help I have no idea what to do

[GoodForSomething]

here is the log it has happened multiple times the game works fine until i open my inventory or a chest thats all i know that causes this i havent been able to do any thing else to get more info im not good with computers please help
2013-10-24 20:18:05 [INFO] [Minecraft] Stopping server
2013-10-24 20:18:05 [INFO] [Minecraft] Saving players
2013-10-24 20:18:05 [INFO] [STDOUT] Unloading Player: Sweeny_T0dd
2013-10-24 20:18:05 [INFO] [Minecraft] Saving worlds
2013-10-24 20:18:05 [INFO] [Minecraft] Saving chunks for level 'Our Farm'/Overworld
2013-10-24 20:18:05 [INFO] [Minecraft] Saving chunks for level 'Our Farm'/Nether
2013-10-24 20:18:05 [INFO] [ForgeModLoader] [Thaumcraft] Removed 16 aura nodes when world 0 unloaded.
2013-10-24 20:18:06 [INFO] [ForgeModLoader] [Thaumcraft] Removed 0 aura nodes when world -1 unloaded.
2013-10-24 20:18:06 [INFO] [ForgeModLoader] Unloading dimension 0
2013-10-24 20:18:06 [INFO] [ForgeModLoader] Unloading dimension -1
2013-10-24 20:18:10 [INFO] [STDERR] t: Exception in world tick
2013-10-24 20:18:10 [INFO] [STDERR] at net.minecraft.client.Minecraft.l(Minecraft.java:1890)
2013-10-24 20:18:10 [INFO] [STDERR] at net.minecraft.client.Minecraft.J(Minecraft.java:848)
2013-10-24 20:18:10 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:773)
2013-10-24 20:18:10 [INFO] [STDERR] at java.lang.Thread.run(Thread.java:695)
2013-10-24 20:18:10 [INFO] [STDERR] Caused by: java.lang.NullPointerException
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.AWTUtil.getPointerLocation(AWTUtil.java:120)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.AWTUtil.getCursorPosition(AWTUtil.java:138)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.MouseEventQueue.resetCursorToCenter(MouseEventQueue.java:115)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.MacOSXMouseEventQueue.resetCursorToCenter(MacOSXMouseEventQueue.java:71)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.MouseEventQueue.setGrabbed(MouseEventQueue.java:101)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.MacOSXMouseEventQueue.setGrabbed(MacOSXMouseEventQueue.java:57)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.opengl.MacOSXDisplay.grabMouse(MacOSXDisplay.java:347)
2013-10-24 20:18:10 [INFO] [STDERR] at org.lwjgl.input.Mouse.setGrabbed(Mouse.java:636)
2013-10-24 20:18:10 [INFO] [STDERR] at asr.b(SourceFile:32)
2013-10-24 20:18:10 [INFO] [STDERR] at net.minecraft.client.Minecraft.i(Minecraft.java:1224)
2013-10-24 20:18:10 [INFO] [STDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:651)
2013-10-24 20:18:10 [INFO] [STDERR] at bag.a(SourceFile:260)
2013-10-24 20:18:10 [INFO] [STDERR] at ayh.a(NetClientHandler.java:1038)
2013-10-24 20:18:10 [INFO] [STDERR] at de.a(SourceFile:33)
2013-10-24 20:18:10 [INFO] [STDERR] at cf.b(MemoryConnection.java:80)
2013-10-24 20:18:10 [INFO] [STDERR] at ayh.d(NetClientHandler.java:240)
2013-10-24 20:18:10 [INFO] [STDERR] at ayp.b(WorldClient.java:92)
2013-10-24 20:18:10 [INFO] [STDERR] at net.minecraft.client.Minecraft.l(Minecraft.java:1874)
2013-10-24 20:18:10 [INFO] [STDERR] ... 3 more
2013-10-24 20:18:20 [INFO] [STDOUT] Stopping!
2013-10-24 20:18:20 [INFO] [STDOUT] SoundSystem shutting down...
2013-10-24 20:18:20 [INFO] [STDOUT] Author: Paul Lamb, www.paulscode.com

 

[lavarthan]

Your log does not show what OS you have, but this error is usually caused by a Mac with Java 7. If you have a Mac then you either need to downgrade to Java 6 or update your lwjgl to 2.9.0 Check here, part 3, to downgrade Java and here to update your lwjgl. Substitute the '~/Library/Application Support' folder for the mod pack folder. You will need to update your lwjgl for each mod pack as each mod pack folder has its own version of lwjgl.