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I have experienced a problem... Every time I log on to minecraft, the mojang logo comes up, then the dirt-background shows, and boom, minecraft has crashed... The crash report is right here, and as the technical genious I am, I can of course not fix this myself...

---- Minecraft Crash Report ----
// Oops.

Time: 25.05.13 11:49
Description: Unexpected error

java.lang.IllegalArgumentException: ByteBuffer is not direct
at org.lwjgl.BufferChecks.checkDirect(BufferChecks.java:105)
at org.lwjgl.BufferChecks.checkBuffer(BufferChecks.java:164)
at org.lwjgl.opengl.GL11.glTexSubImage2D(GL11.java:2908)
at bio.b(SourceFile:333)
at bil.l(SourceFile:148)
at bir.c(SourceFile:166)
at bge.b(SourceFile:294)
at net.minecraft.client.Minecraft.l(SourceFile:1060)
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:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 456365160 bytes (435 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: [com.prupe.mcpatcher.MCPatcherUtils, Config, MCLogger, ...], [com.prupe.mcpatcher.mod.ColorizeItem, AAHelper, TessellatorUtils, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: GeForce GT 320M/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: WesterosCraft 27 April 2013 (1).zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

Nevermind, I solved it myself.

how did you slove it? i have the same problem, except my texture pack is sphax..my error is as follows:

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 5/25/13 1:45 PM
Description: Unexpected error

java.lang.IllegalArgumentException: ByteBuffer is not direct
at org.lwjgl.BufferChecks.checkDirect(BufferChecks.java:105)
at org.lwjgl.BufferChecks.checkBuffer(BufferChecks.java:164)
at org.lwjgl.opengl.GL11.glTexSubImage2D(GL11.java:2908)
at bio.b(SourceFile:333)
at bil.l(SourceFile:148)
at bir.c(SourceFile:166)
at bge.b(SourceFile:294)
at net.minecraft.client.Minecraft.l(SourceFile:1060)
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:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 457595240 bytes (436 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: [com.prupe.mcpatcher.MCPatcherUtils, Config, MCLogger, ...], [com.prupe.mcpatcher.mod.ColorizeItem, AAHelper, TessellatorUtils, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel Bear Lake B GL version 1.4.0 - Build 7.14.10.1437, Intel
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Sphax PureBDcraft 64x MC15.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

I simply used the option "Force update" (Click on options in the launcher). I also deleted the texturepack first, but I don't think that is neccesary.

thanks, it worked.

now i have another error on attempting to join a server.

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 5/25/13 8:59 PM
Description: Ticking screen

java.lang.NullPointerException
at bdk.a(SourceFile:648)
at er.a(SourceFile:28)
at ci.b(SourceFile:350)
at bdk.d(SourceFile:95)
at bdn.c(SourceFile:73)
at net.minecraft.client.Minecraft.l(SourceFile:1105)
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 bdk.a(SourceFile:648)
at er.a(SourceFile:28)
at ci.b(SourceFile:350)
at bdk.d(SourceFile:95)
at bdn.c(SourceFile:73)

-- Affected screen --
Details:
Screen name: bdn
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1105)
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 Vista (x86) version 6.0
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 477295632 bytes (455 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 Bear Lake B GL version 1.4.0 - Build 7.14.10.1437, 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: nullit says ticcking screen instead of unexpected error, i just noticed

Considering I am as skillful at things like this as an average sloth, I might not be of much help. But, well, you could always try to use the Force Update again... I could not get so very much out of the crash report other than that your minecraft seems to be Vanilla (not modded) and that you do not have texturepacks. But even so, it might be worth a try to check in the mods and texturepack files wether there actually are no mods or textures.

But this was about a server, right? Well, you must assure yourself that your internet connection is good enough. If the server uses for example Hamachi, then you will have to use it as well. Eventually, the server itself might have problems getting you in, for some reason. Maybe you should try to contact the owner.