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I tried to get on my world today and got this lovely surprise.



Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\Alex\AppData\Roaming\.minecraft\crash-reports\crash-2012-10-10_21.22.32-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 7f4e7f05 --------
Generated 10/10/12 9:22 PM

- Minecraft Version: 1.3.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_07, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 476887776 bytes (454 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- LWJGL: 2.4.2
- OpenGL: AMD Radeon HD 6570M/5700 Series GL version 4.2.11762 Compatibility Profile Context, ATI Technologies Inc.
- Is Modded: Probably not
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)

java.lang.RuntimeException: Failed to check session lock, aborting
at aeb.h(SourceFile:49)
at aeb.<init>(SourceFile:35)
at adx.<init>(SourceFile:16)
at ady.a(SourceFile:78)
at net.minecraft.client.Minecraft.a(SourceFile:1288)
at apq.e(SourceFile:142)
at apr.a(SourceFile:189)
at app.a(SourceFile:176)
at apq.a(SourceFile:162)
at auw.b(SourceFile:706)
at net.minecraft.client.Minecraft.J(SourceFile:607)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT b2a63c74 ----------

can anyone interpret that for me? and give me some help? thanks a bunch!