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here is the nei report
code]NEI Version: 1.5.2.11
java.lang.ClassCastException: net.minecraft.nbt.NBTTagEnd cannot be cast to net.minecraft.nbt.NBTTagCompound
at codechicken.nei.NEIClientConfig.loadWorld(NEIClientConfig.java:320)
at codechicken.nei.NEICPH.handleSMPCheck(NEICPH.java:119)
at codechicken.nei.NEICPH.handlePacket(NEICPH.java:27)
at codechicken.core.packet.PacketCustom$ClientPacketHandler.handle(PacketCustom.java:104)
at codechicken.core.packet.PacketCustom$CustomPacketHandler.onPacketData(PacketCustom.java:73)
at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
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.Minecraft.func_71407_l(Minecraft.java:1898)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)
[/code]

here is the minecraft report

---- Minecraft Crash Report ----
// Why is it breaking

Time: 7/30/13 12:32 AM
Description: Updating screen events

java.lang.NullPointerException
at codechicken.nei.NEIClientConfig.setSearchExpression(NEIClientConfig.java:546)
at codechicken.nei.SearchField.onTextChange(SearchField.java:40)
at codechicken.nei.TextField.setText(TextField.java:143)
at codechicken.nei.TextField.handleKeyPress(TextField.java:101)
at codechicken.nei.LayoutManager.keyTyped(LayoutManager.java:148)
at codechicken.nei.forge.GuiContainerManager.firstKeyTyped(GuiContainerManager.java:446)
at net.minecraft.client.gui.inventory.GuiContainer.func_73860_n(GuiContainer.java:959)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:115)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1499)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
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 codechicken.nei.NEIClientConfig.setSearchExpression(NEIClientConfig.java:546)
at codechicken.nei.SearchField.onTextChange(SearchField.java:40)
at codechicken.nei.TextField.setText(TextField.java:143)
at codechicken.nei.TextField.handleKeyPress(TextField.java:101)
at codechicken.nei.LayoutManager.keyTyped(LayoutManager.java:148)
at codechicken.nei.forge.GuiContainerManager.firstKeyTyped(GuiContainerManager.java:446)
at net.minecraft.client.gui.inventory.GuiContainer.func_73860_n(GuiContainer.java:959)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:115)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiChest

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['bauch1234'/12, l='MpServer', x=475.89, y=15.62, z=-996.54]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (422,4,-1082), Chunk: (at 6,0,6 in 26,-68; contains blocks 416,0,-1088 to 431,255,-1073), Region: (0,-3; contains chunks 0,-96 to 31,-65, blocks 0,0,-1536 to 511,255,-1025)
Level time: 82581 game time, 82581 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: 4 total; [EntityChicken['Chicken'/5, l='MpServer', x=422.44, y=4.00, z=-1006.44], EntityChicken['Chicken'/9, l='MpServer', x=452.53, y=4.00, z=-1030.47], EntityChicken['Chicken'/11, l='MpServer', x=486.41, y=4.00, z=-954.44], EntityClientPlayerMP['bauch1234'/12, l='MpServer', x=475.89, y=15.62, z=-996.54]]
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:2413)
at net.minecraft.client.Minecraft.run(Minecraft.java:775)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_20, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 261199296 bytes (249 MB) / 601620480 bytes (573 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 9254 (518224 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.51 FML v5.2.5.686 Minecraft Forge 7.8.0.686 30 mods loaded, 30 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.5.686} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.0.686} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.8.6.4} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.5.2.11} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TooMuchTNT{2.3} [TooMuchTNT] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{3.5.1} [BuildCraft] (buildcraft-A-3.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{3.5.1} [BC Builders] (buildcraft-A-3.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{3.5.1} [BC Energy] (buildcraft-A-3.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{3.5.1} [BC Factory] (buildcraft-A-3.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{3.5.1} [BC Transport] (buildcraft-A-3.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{3.5.1} [BC Silicon] (buildcraft-A-3.5.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ClaySoldiersMod{9.1} [Clay Soldiers Mod] (CSM_v911.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Railcraft{7.2.1.0} [Railcraft] (ft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ICBM|Contraption{1.2.0} [ICBM] (ICBM_Contraption_v1.2.0.153.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ICBM|Sentry{1.2.0} [ICBM] (ICBM_Sentry_v1.2.0.153.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ICBM|Explosion{1.2.0} [ICBM] (ICBM_Explosion_v1.2.0.153.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SlimevoidLib{2.0.1.1} [Slimevoid Library] (SlimevoidLib-Universal-v2.0.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LittleBlocksMod{2.1.0.0} [Little Blocks] (LittleBlocks-Universal-v2.1.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
More Pistons{1.3.3 for [1.5.2 Build Smeagol]} [More Pistons] (More-Pistons-Mod-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MutantCreatures{1.3.4} [Mutant Creatures] (Mutant Creatures v1.3.4 mc1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_PandorasBox{1.4.4} [mod_PandorasBox] (PandorasBox_1.4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SAP_Man{1.4.2} [SanAndreasPs Managers] (SAP_ManPack_v142.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TStormFix{1.0} [Thunderstorm Fix] (SAP_ManPack_v142.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Schematica{1.5.2.29} [Schematica] (Schematica-Mod-1.5.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
secretroomsmod{4.6.0} [SecretRoomsMod] (Secret-Rooms-Mod-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TC{4.0.1_002} [Traincraft] (traincraft-4.0.1_002.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
UtilityMobs{2.0.1} [Utility Mobs] (UtilityMobs 2.0.1 for MC 1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
WirelessRedstoneCore{1.7} [Wireless Redstone] (WirelessRedstone-Universal-v1.7.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MSC{1.5.2.0} [Mob Spawn Controls] (Forge_MobSpawnControlsv1.5.2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2622, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 283 (15848 bytes; 0 MB) allocated, 19 (1064 bytes; 0 MB) used