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every time i try to enter a world this error crashes my game

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 12/28/13 2:56 PM
Description: Unexpected error

java.lang.NoSuchFieldError: CHAT
at pixelmon.client.gui.GuiChatOverlay.eventHandler(GuiChatOverlay.java:23)
at net.minecraftforge.event.ASMEventHandler_7_GuiChatOverlay_eventHandler_Pre.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraftforge.event.EventBus.post(EventBus.java:108)
at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:861)
at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:102)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1014)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:944)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


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

-- Head --
Stacktrace:
at pixelmon.client.gui.GuiChatOverlay.eventHandler(GuiChatOverlay.java:23)
at net.minecraftforge.event.ASMEventHandler_7_GuiChatOverlay_eventHandler_Pre.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraftforge.event.EventBus.post(EventBus.java:108)
at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:861)
at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:102)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['PaddyPorter1234'/18, l='MpServer', x=227.50, y=66.62, z=134.50]]
Chunk stats: MultiplayerChunkCache: 0
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (234,64,140), Chunk: (at 10,4,12 in 14,8; contains blocks 224,0,128 to 239,255,143), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 14 game time, 14 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [EntityClientPlayerMP['PaddyPorter1234'/18, l='MpServer', x=227.50, y=66.62, z=134.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2310)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:861)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 163084912 bytes (155 MB) / 317833216 bytes (303 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 6259 (350504 bytes; 0 MB) allocated, 6259 (350504 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v8.11 FML v6.4.3.883 Minecraft Forge 9.11.0.883 4 mods loaded, 4 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.3.883} [Forge Mod Loader] (minecraftforge-9.11.0.883.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.0.883} [Minecraft Forge] (minecraftforge-9.11.0.883.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
pixelmon{2.5.6} [Pixelmon] (Pixelmon 2.5.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.6.4-Forge9.11.0.883
LWJGL: 2.9.0
OpenGL: GeForce 9800 GT/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 27 (1512 bytes; 0 MB) allocated, 27 (1512 bytes; 0 MB) used