Minecraft Forums

Ok, I need some help guys. I went looking for the default textures of blocks in the minecraft files, I had previously found them on my laptop and realized that the folder containing these textures (called simply "t" under texturepacks-mp-cache) was not there. I was certain it wasn't hidden either. So stupid me, i made a copy of the folder (from my laptop) and sent it to myself and put it on my desktop. I simply put it where it needed to go. I restarted minecraft (without changing anything else and every time i try to load a game it crashes and gives me this:

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---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 5/14/13 7:24 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:
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-- 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 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: 475686880 bytes (453 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: ATI Radeon HD 5670 GL version 4.2.11733 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: Derivation5_2.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null



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I immediately removed the file, but the same thing occured. I tried to force update and the problem remained. I even tried to use another texture pack but that didnt work either. I tried to move my saved games to my laptop but the games would crash there as well. Am I screwed? I have spent hundreds of hours on these games and would hate to lose them. Any advice would be super helpful. Even if you could tell me where to submit the report to majong. Thanks!

This is complaining about a file %appdata%/.minecraft/saves/<SOME WORLD NAME>/session.lock

This file is used to prevent two copies of minecraft from modifying the same world at the same time.
If you are sure there is no other copy of minecraft still running, then perhaps you have modified the permissions /ownership of all the files in your save so that minecraft can't do what it needs to.

If that were the case, would you have any idea of how to fix it?I found the file it is complaining about - can I just delete it?

Never mind - I deleted the file on all my saves and it all works - Thank you so much for your help!