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As soon as I install forge and start Minecraft it's fine, but when I try to load a world, I get this:


---- Minecraft Crash Report ----
// Don't do that.

Time: 4/21/13 2:20 PM
Description: Ticking screen

java.lang.ClassCastException: net.minecraft.client.entity.EntityClientPlayerMP cannot be cast to cpw.mods.fml.common.network.Player
at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:237)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:83)
at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1571)
at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:59)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:266)
at net.minecraft.client.gui.GuiDownloadTerrain.func_73876_c(SourceFile:31)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1522)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:831)
at net.minecraft.client.Minecraft.run(Minecraft.java:756)
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 cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:237)
at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:83)
at net.minecraft.client.multiplayer.NetClientHandler.func_72501_a(NetClientHandler.java:1571)
at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:59)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:266)
at net.minecraft.client.gui.GuiDownloadTerrain.func_73876_c(SourceFile:31)

-- Affected screen --
Details:
Screen name: ~~ERROR~~ NullPointerException: null

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['TheeEnglishMoose'/153, l='MpServer', x=238.59, y=65.62, z=-20.24]]
Chunk stats: MultiplayerChunkCache: 0
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (248,64,256), Chunk: (at 8,4,0 in 15,16; contains blocks 240,0,256 to 255,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 2606326 game time, 2830534 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['TheeEnglishMoose'/153, l='MpServer', x=238.59, y=65.62, z=-20.24]]
Retry entities: 0 total; []
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2405)
at net.minecraft.client.Minecraft.run(Minecraft.java:772)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 493797520 bytes (470 MB) / 656015360 bytes (625 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 659 (36904 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v7.44 FML v5.1.8.611 Minecraft Forge 7.7.1.611 3 mods loaded, 3 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: Intel® HD Graphics GL version 3.1.0 - Build 9.17.10.2828, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Sphax PureBDcraft 32x MC15.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: 123 (6888 bytes; 0 MB) allocated, 10 (560 bytes; 0 MB) used




Please, someone help.

more help could be useful
pc specs
anything really?

just asking though do you lag normaly in minecraft without the forge cause that could be it

also make sure you have no mods installed

Your using an older version of forge for 1.5.1 try updating to 7.7.2.682 for 1.5.1 and let me know?

EDIT: Just realized I necroed a thread!

@CGameing_RULES: NEVER NECRO A THREAD!! People like me could come in and try to "help" without realizing that this thread was dead a year ago!!!!