Minecraft doesn't work when i enter to a world.Here is the error message:
---- Minecraft Crash Report ----
// Why did you do that?

Time: 28/07/14 13.38
Description: Registering texture

java.lang.IllegalArgumentException: Unknown image type 0
at java.awt.image.BufferedImage.<init>(Unknown Source)
at csa.a(SourceFile:40)
at csn.a(SourceFile:56)
at clu.a(SourceFile:122)
at clu.a(SourceFile:70)
at clu.a(SourceFile:22)
at cly.a(SourceFile:114)
at cly.a(SourceFile:107)
at chp.a(SourceFile:32)
at cop.a(SourceFile:98)
at cop.a(SourceFile:334)
at cop.b(SourceFile:368)
at bxd.a(SourceFile:249)
at bxd.a(SourceFile:107)
at bxv.a(SourceFile:36)
at bxr.a(SourceFile:548)
at cht.b(SourceFile:1007)
at brp.ar(SourceFile:896)
at brp.a(SourceFile:311)
at net.minecraft.client.main.Main.main(SourceFile:120)

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

– Head –
Stacktrace:
at java.awt.image.BufferedImage.<init>(Unknown Source)
at csa.a(SourceFile:40)

– Resource location being registered –
Details:
Resource location: minecraft:b15
Texture object class: csa
Stacktrace:
at csn.a(SourceFile:56)
at clu.a(SourceFile:122)
at clu.a(SourceFile:70)
at clu.a(SourceFile:22)

– Block Entity Details –
Details:
Name: Banner // bbf
Stacktrace:
at cly.a(SourceFile:114)
at cly.a(SourceFile:107)
at chp.a(SourceFile:32)
at cop.a(SourceFile:98)
at cop.a(SourceFile:334)

– Item being rendered –
Details:
Item Type: ajb@146ccac
Item Aux: 15
Item NBT: null
Item Foil: false
Stacktrace:
at cop.b(SourceFile:368)
at bxd.a(SourceFile:249)
at bxd.a(SourceFile:107)
at bxv.a(SourceFile:36)
at bxr.a(SourceFile:548)

– Screen render details –
Details:
Screen name: bxr
Mouse location: Scaled: (240, 123). Absolute: (481, 232)
Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [cha['Dark_Soul_96'/0, l='MpServer', x=2425,50, y=56,00, z=-628,50]]
Chunk stats: MultiplayerChunkCache: 25, 25
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: 2431,00,4,00,-637,00 - World: (2431,4,-637), Chunk: (at 15,0,3 in 151,-40; contains blocks 2416,0,-640 to 2431,255,-625), Region: (4,-2; contains chunks 128,-64 to 159,-33, blocks 2048,0,-1024 to 2559,255,-513)
Level time: 176 game time, 176 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 1 total; [cha['Dark_Soul_96'/0, l='MpServer', x=2425,50, y=56,00, z=-628,50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at ccz.a(SourceFile:308)
at brp.b(SourceFile:2254)
at brp.a(SourceFile:320)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 14w30c
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.6.0, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 113429576 bytes (108 MB) / 304787456 bytes (290 MB) up to 532742144 bytes (508 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 14w30c
LWJGL: 2.9.1
OpenGL: ATI Mobility Radeon HD 3650 GL version 2.1.7417 Release, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because EXT_framebuffer_object is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: Italiano (Italia)
Profiler Position: N/A (disabled)