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Please help...please !!! my kid spent so many time in this game... don't want to see him loses all of his hard work...
here is the crash-client report. Please help


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

Time: 1/5/13 9:06 PM
Description: Updating screen events

java.lang.RuntimeException: Failed to check session lock, aborting
at ahv.h(SourceFile:49)
at ahv.<init>(SourceFile:35)
at ahr.<init>(SourceFile:16)
at ahs.a(SourceFile:78)
at net.minecraft.client.Minecraft.a(SourceFile:1370)
at auo.e(SourceFile:157)
at auo.a(SourceFile:122)
at aul.a(SourceFile:72)
at aul.d(SourceFile:127)
at aul.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1086)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at ahv.h(SourceFile:49)
at ahv.<init>(SourceFile:35)
at ahr.<init>(SourceFile:16)
at ahs.a(SourceFile:78)
at net.minecraft.client.Minecraft.a(SourceFile:1370)
at auo.e(SourceFile:157)
at auo.a(SourceFile:122)
at aul.a(SourceFile:72)
at aul.d(SourceFile:127)
at aul.m(SourceFile:111)

-- Affected screen --
Details:
Screen name: bey
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1086)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 473515704 bytes (451 MB) / 519110656 bytes (495 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: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2476, Intel
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

After the lookup of the error, it seems to be a problem with the world. You may generate a new one.

It seems like my kids has lost every single world he has created...I guess it is what it is and Thank you guys for your help, Thanks!

Could you put some of his worlds up for download so i can look at them? It might not be a problem with the world, but with the client. And if it is the world i might be able to fix it. You can use a file sharing web sight like mediafire.

Thank you 8hu5rust !!!

Could you tell me what are the files I need to share and under which minecraft folders ?

Thanks again !!!!