Client crash when generating single player world

My client crashed when I tried to create a new world. I clicked the "create new world" button, then pressed F11 immediately after (I dont know if that has anything to do with it). The screen went black for a few seconds, then this error came up:

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception ticking world

A full error report has been saved to C:\Users\Ben\AppData\Roaming\.minecraft\crash-reports\crash-2013-02-04_22.13.23-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash 😞

— BEGIN ERROR REPORT 69fac206 --------
Full report at:
C:\Users\Ben\AppData\Roaming\.minecraft\crash-reports\crash-2013-02-04_22.13.23-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 2/4/13 10:13 PM

– Head –
Stacktrace:
at in.a(SourceFile:373)
at in.b(SourceFile:136)

– Affected level –
Details:
Level name: New World
All players: 0 total; []
Chunk stats: ServerChunkCache: 1378 Drop: 0
Level seed: -390626751225751654
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (406,4,2010), Chunk: (at 6,0,10 in 25,125; contains blocks 400,0,2000 to 415,255,2015), Region: (0,3; contains chunks 0,96 to 31,127, blocks 0,0,1536 to 511,255,2047)
Level time: 1 game time, 1 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 156966 (now: false), thunder time: 95584 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:736)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)

– System Details –
Details:
Minecraft Version: 1.4.6
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_10, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2820427920 bytes (2689 MB) / 3193110528 bytes (3045 MB) up to 3193110528 bytes (3045 MB)
JVM Flags: 2 total; -Xmx3g -Xms3g
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdates, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
ModLoader: Mods loaded: 3
ModLoader 1.4.6
mod_RadarBro 1.4.6
mod_TooManyItems 1.4.6 2012-12-26

Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated

java.lang.IllegalStateException: TickNextTick list out of synch
at in.a(SourceFile:373)
at in.b(SourceFile:136)
at net.minecraft.server.MinecraftServer.r(SourceFile:736)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)
— END ERROR REPORT 47dc1cb3 ----------