---- Minecraft Crash Report ----
// Sorry :(

Time: 6/27/13 11:48 AM
Description: Updating screen events

java.lang.RuntimeException: Failed to check session lock, aborting
	at ali.h(SourceFile:44)
	at ali.<init>(SourceFile:30)
	at ale.<init>(SourceFile:16)
	at alf.a(SourceFile:83)
	at atm.a(SourceFile:1411)
	at avx.e(SourceFile:157)
	at avx.a(SourceFile:122)
	at avu.a(SourceFile:71)
	at avu.d(SourceFile:125)
	at avu.m(SourceFile:109)
	at atm.k(SourceFile:1157)
	at atm.S(SourceFile:662)
	at atm.d(SourceFile:618)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at ali.h(SourceFile:44)
	at ali.<init>(SourceFile:30)
	at ale.<init>(SourceFile:16)
	at alf.a(SourceFile:83)
	at atm.a(SourceFile:1411)
	at avx.e(SourceFile:157)
	at avx.a(SourceFile:122)
	at avu.a(SourceFile:71)
	at avu.d(SourceFile:125)
	at avu.m(SourceFile:109)

-- Affected screen --
Details:
	Screen name: blg
Stacktrace:
	at atm.k(SourceFile:1157)
	at atm.S(SourceFile:662)
	at atm.d(SourceFile:618)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.6.0_31, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 203613672 bytes (194 MB) / 234749952 bytes (223 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	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
	Launched Version: 1.6
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6800 Series GL version 4.2.12002 Compatibility Profile Context 9.12.0.0, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null