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---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 8/4/13 7:10 AM
Description: Rendering screen

java.lang.NullPointerException
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:119)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(SourceFile:31)
at net.minecraft.client.gui.inventory.GuiInventory.func_73863_a(SourceFile:48)
at pixelmon.client.gui.inventoryExtended.GuiInventoryPixelmonExtended.func_73863_a(GuiInventoryPixelmonExtended.java:81)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1021)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:871)
at net.minecraft.client.Minecraft.run(Minecraft.java:760)
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 net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:119)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(SourceFile:31)
at net.minecraft.client.gui.inventory.GuiInventory.func_73863_a(SourceFile:48)
at pixelmon.client.gui.inventoryExtended.GuiInventoryPixelmonExtended.func_73863_a(GuiInventoryPixelmonExtended.java:81)

-- Screen render details --
Details:
Screen name: pixelmon.client.gui.inventoryExtended.GuiInventoryPixelmonExtended
Mouse location: Scaled: (213, 122). Absolute: (640, 369)
Screen size: Scaled: (427, 246). Absolute: (1280, 738). Scale factor of 3

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['badboy81'/188377, l='MpServer', x=-419.85, y=64.62, z=405.31]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-166,84,259), Chunk: (at 10,5,3 in -11,16; contains blocks -176,0,256 to -161,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 116117350 game time, 154538 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: adventure (ID 2). Hardcore: false. Cheats: false
Forced entities: 38 total; [EntityClientPlayerMP['badboy81'/188377, l='MpServer', x=-419.85, y=64.62, z=405.31], EntityPixelmon['Pidgey'/189056, l='MpServer', x=-379.47, y=68.00, z=453.59], EntityVillager['Poke' Clerk'/186094, l='MpServer', x=-438.25, y=64.00, z=395.50], EntityPixelmon['Vulpix'/189003, l='MpServer', x=-387.49, y=67.81, z=443.86], EntityOtherPlayerMP['LtRamirez'/159952, l='MpServer', x=-381.16, y=63.00, z=389.97], EntityPixelmon['Miltank'/189876, l='MpServer', x=-387.30, y=91.00, z=374.00], EntityPixelmon['Miltank'/189877, l='MpServer', x=-391.30, y=91.00, z=373.00], EntityPixelmon['Vulpix'/189201, l='MpServer', x=-357.53, y=80.00, z=368.53], EntityPixelmon['Machop'/188998, l='MpServer', x=-450.91, y=72.00, z=367.72], EntityVillager['Gramps''/185475, l='MpServer', x=-433.31, y=16.00, z=438.63], EntityOtherPlayerMP['LtRamirez'/159952, l='MpServer', x=-440.00, y=61.00, z=395.00], EntityPixelmon['Pidgey'/188479, l='MpServer', x=-464.38, y=65.00, z=384.54], EntityPixelmon['Zubat'/189141, l='MpServer', x=-421.13, y=44.66, z=430.91], EntityPixelmon['Zubat'/189142, l='MpServer', x=-426.13, y=45.00, z=425.88], EntityPixelmon['Zubat'/189143, l='MpServer', x=-428.84, y=45.04, z=426.84], EntityPixelmon['Graveler'/188709, l='MpServer', x=-458.38, y=63.00, z=403.84], EntityPixelmon['Zubat'/189144, l='MpServer', x=-431.13, y=45.00, z=431.13], EntityVillager['Grandmy Mist'/185730, l='MpServer', x=-400.72, y=65.00, z=411.47], EntityPixelmon['Graveler'/189778, l='MpServer', x=-420.16, y=71.00, z=442.73], EntityPixelmon['Machoke'/189718, l='MpServer', x=-411.19, y=71.00, z=433.97], EntityItem['item.item.rottenFlesh'/189093, l='MpServer', x=-370.69, y=26.13, z=391.66], EntityItem['item.item.rottenFlesh'/189849, l='MpServer', x=-369.66, y=26.13, z=394.00], EntityPixelmon['Graveler'/188830, l='MpServer', x=-395.69, y=72.00, z=432.28], EntityPixelmon['Geodude'/188754, l='MpServer', x=-465.59, y=66.00, z=397.09], EntityPixelmon['Lunatone'/189568, l='MpServer', x=-447.50, y=67.00, z=428.50], EntityPixelmon['Geodude'/187337, l='MpServer', x=-450.81, y=71.00, z=369.63], EntityVillager['Money exchange'/185725, l='MpServer', x=-455.59, y=62.00, z=411.31], EntityItem['item.item.rottenFlesh'/188987, l='MpServer', x=-370.88, y=29.13, z=381.88], EntityPixelmon['Pidgey'/189460, l='MpServer', x=-460.25, y=65.00, z=450.25], EntityPixelmon['Machoke'/189462, l='MpServer', x=-421.72, y=66.00, z=373.09], EntityOtherPlayerMP['LtRamirez'/159952, l='MpServer', x=-473.41, y=72.00, z=341.44], EntityPixelmon['Graveler'/189764, l='MpServer', x=-455.50, y=71.00, z=400.50], EntityPixelmon['Pidgey'/188749, l='MpServer', x=-461.47, y=61.00, z=421.41], EntityPokeBall['entity.Pixelmon.Pokeball.name'/188978, l='MpServer', x=-366.06, y=-31579163.81, z=349.84], EntityPixelmon['Machoke'/188977, l='MpServer', x=-365.06, y=65.00, z=410.93], EntityPixelmon['Miltank'/189828, l='MpServer', x=-442.50, y=76.00, z=361.50], EntityItem['item.item.rottenFlesh'/189280, l='MpServer', x=-428.66, y=20.13, z=457.59], EntityItem['item.item.rottenFlesh'/188980, l='MpServer', x=-364.84, y=29.13, z=380.81]]
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:2414)
at net.minecraft.client.Minecraft.run(Minecraft.java:776)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 294358920 bytes (280 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 21231 (1188936 bytes; 1 MB) allocated, 2162 (121072 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v7.51 FML v5.2.23.737 Minecraft Forge 7.8.1.737 5 mods loaded, 5 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{5.2.23.737} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{7.8.1.737} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Pixelmon{2.2} [Pixelmon] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CustomNpcs{0.8} [CustomNpcs] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: GeForce Go 6150/PCI/SSE2/3DNOW! GL version 2.1.2, NVIDIA Corporation
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: 1375 (77000 bytes; 0 MB) allocated, 195 (10920 bytes; 0 MB) used

have the exact same problem but i have many more mods installed.