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So I am trying to play on a pixelmon server that's still running 1.6.4. I downloaded the recommended version of Forge for 1.6.4, and every time I try to enter the server, minecraft crashes. I don't have any other mods, and everything I googled said to remove all mods...so obviously that wont work for me. So if anyone knows what I can do that would be wonderful! Here is the crash report:

This doesn't make any sense!

Time: 1/25/14 5:57 PM
Description: Exception in world tick

java.lang.ClassCastException: net.minecraft.client.gui.inventory.GuiChest cannot be cast to net.minecraft.client.multiplayer.GuiConnecting
at cpw.mods.fml.client.FMLClientHandler.disconnectIDMismatch(FMLClientHandler.java:598)
at cpw.mods.fml.common.FMLCommonHandler.disconnectIDMismatch(FMLCommonHandler.java:463)
at cpw.mods.fml.common.network.ModIdMapPacket.execute(ModIdMapPacket.java:101)
at cpw.mods.fml.common.network.FMLNetworkHandler.handleFMLPacket(FMLNetworkHandler.java:116)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:81)
at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1651)
at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:61)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.WorldClient.func_72835_b(WorldClient.java:99)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1930)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
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 cpw.mods.fml.client.FMLClientHandler.disconnectIDMismatch(FMLClientHandler.java:598)
at cpw.mods.fml.common.FMLCommonHandler.disconnectIDMismatch(FMLCommonHandler.java:463)
at cpw.mods.fml.common.network.ModIdMapPacket.execute(ModIdMapPacket.java:101)
at cpw.mods.fml.common.network.FMLNetworkHandler.handleFMLPacket(FMLNetworkHandler.java:116)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:81)
at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1651)
at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:61)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Dovisary'/28850757, l='MpServer', x=735.50, y=119.62, z=-53.50]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (735,118,-54), Chunk: (at 15,7,10 in 45,-4; contains blocks 720,0,-64 to 735,255,-49), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
Level time: 66546364 game time, 62000 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: 10 total; [EntityClientPlayerMP['Dovisary'/28850757, l='MpServer', x=735.50, y=119.62, z=-53.50], EntityItemFrame['entity.ItemFrame.name'/372, l='MpServer', x=738.50, y=118.50, z=-39.06], EntityOtherPlayerMP['gameboyrock1'/28849483, l='MpServer', x=773.86, y=113.33, z=-56.09], EntityItemFrame['entity.ItemFrame.name'/369, l='MpServer', x=738.50, y=118.50, z=-67.94], EntityItemFrame['entity.ItemFrame.name'/368, l='MpServer', x=732.50, y=118.50, z=-39.06], EntityItemFrame['entity.ItemFrame.name'/371, l='MpServer', x=749.94, y=118.50, z=-56.50], EntityItemFrame['entity.ItemFrame.name'/370, l='MpServer', x=749.94, y=118.50, z=-50.50], EntityItemFrame['entity.ItemFrame.name'/365, l='MpServer', x=732.50, y=118.50, z=-67.94], EntityItemFrame['entity.ItemFrame.name'/366, l='MpServer', x=721.06, y=118.50, z=-56.50], EntityItemFrame['entity.ItemFrame.name'/367, l='MpServer', x=721.06, y=118.50, z=-50.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1943)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
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)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Dovisary'/28850757, l='MpServer', x=735.50, y=119.62, z=-53.50]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (735,118,-54), Chunk: (at 15,7,10 in 45,-4; contains blocks 720,0,-64 to 735,255,-49), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
Level time: 66546364 game time, 62000 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: 10 total; [EntityClientPlayerMP['Dovisary'/28850757, l='MpServer', x=735.50, y=119.62, z=-53.50], EntityItemFrame['entity.ItemFrame.name'/372, l='MpServer', x=738.50, y=118.50, z=-39.06], EntityOtherPlayerMP['gameboyrock1'/28849483, l='MpServer', x=773.86, y=113.33, z=-56.09], EntityItemFrame['entity.ItemFrame.name'/369, l='MpServer', x=738.50, y=118.50, z=-67.94], EntityItemFrame['entity.ItemFrame.name'/368, l='MpServer', x=732.50, y=118.50, z=-39.06], EntityItemFrame['entity.ItemFrame.name'/371, l='MpServer', x=749.94, y=118.50, z=-56.50], EntityItemFrame['entity.ItemFrame.name'/370, l='MpServer', x=749.94, y=118.50, z=-50.50], EntityItemFrame['entity.ItemFrame.name'/365, l='MpServer', x=732.50, y=118.50, z=-67.94], EntityItemFrame['entity.ItemFrame.name'/366, l='MpServer', x=721.06, y=118.50, z=-56.50], EntityItemFrame['entity.ItemFrame.name'/367, l='MpServer', x=721.06, y=118.50, z=-50.50]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 149501400 bytes (142 MB) / 232570880 bytes (221 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 21638 (1211728 bytes; 1 MB) allocated, 14 (784 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 3 mods loaded, 3 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 7660D GL version 4.2.12420 Compatibility Profile Context 13.151.0.0, ATI Technologies Inc.
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: 65 (3640 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used