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Hope someone can kindly please assist with a suggested corrective action on my crash report:

---- Minecraft Crash Report ----
// Don't do that.

Time: 22/07/13 8:51 PM
Description: Updating screen events

java.lang.RuntimeException: Failed to check session lock, aborting
at ajt.h(SourceFile:45)
at ajt.<init>(SourceFile:31)
at ajp.<init>(SourceFile:16)
at ajq.a(SourceFile:83)
at net.minecraft.client.Minecraft.a(SourceFile:1363)
at axu.e(SourceFile:166)
at axu.a(SourceFile:131)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
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 ajt.h(SourceFile:45)
at ajt.<init>(SourceFile:31)
at ajp.<init>(SourceFile:16)
at ajq.a(SourceFile:83)
at net.minecraft.client.Minecraft.a(SourceFile:1363)
at axu.e(SourceFile:166)
at axu.a(SourceFile:131)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)

-- Affected screen --
Details:
Screen name: bkf
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
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 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 473820432 bytes (451 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

Thanks Cestislife. Fixed. Much appreciated.