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Hi, i have a problem with my game

when i play game, he crashes and he says:







---- Minecraft Crash Report ----
// Why did you do that?

Time: 03/05/13 07:58 م
Description: Rendering screen

java.lang.NoClassDefFoundError: org/lwjgl/util/glu/GLU
at bkf.b(SourceFile:327)
at bkf.c(SourceFile:416)
at bkf.a(SourceFile:450)
at bfq.b(SourceFile:768)
at net.minecraft.client.Minecraft.K(SourceFile:597)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.util.glu.GLU
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at bkf.b(SourceFile:327)
at bkf.c(SourceFile:416)
at bkf.a(SourceFile:450)

-- Screen render details --
Details:
Screen name: bkf
Mouse location: Scaled: (209, 161). Absolute: (628, 282)
Screen size: Scaled: (342, 256). Absolute: (1024, 768). Scale factor of 3
Stacktrace:
at bfq.b(SourceFile:768)
at net.minecraft.client.Minecraft.K(SourceFile:597)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 423068496 bytes (403 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 5450 GL version 4.1.10362 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null