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Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Rendering screen

A full error report has been saved to /Users/amydarragh/Library/Application Support/minecraft/crash-reports/crash-2013-11-19_20.05.08-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT 95c3dd67 --------
Full report at:
/Users/amydarragh/Library/Application Support/minecraft/crash-reports/crash-2013-11-19_20.05.08-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 11/19/13 8:05 PM

-- Head --
Stacktrace:
at net.minecraft.item.ItemStack.<init>(ItemStack.java:67)
at co.uk.flansmods.common.CreativeTabFlan.getIconItemStack(CreativeTabFlan.java:30)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_74233_a(GuiContainerCreative.java:905)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_74185_a(GuiContainerCreative.java:731)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:107)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(SourceFile:31)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:664)

-- Screen render details --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative
Mouse location: Scaled: (161, 73). Absolute: (484, 533)
Screen size: Scaled: (427, 251). Absolute: (1280, 752). Scale factor of 3

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['mattbuscus14'/16, l='MpServer', x=938.51, y=5.62, z=707.25]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (940,4,696), Chunk: (at 12,0,8 in 58,43; contains blocks 928,0,688 to 943,255,703), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
Level time: 790 game time, 790 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: 1 total; [EntityClientPlayerMP['mattbuscus14'/16, l='MpServer', x=938.51, y=5.62, z=707.25]]
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(Thread.java:695)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 235472488 bytes (224 MB) / 591613952 bytes (564 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 1635 (91560 bytes; 0 MB) allocated, 19 (1064 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 v5.2.23.738 Minecraft Forge 7.8.1.738 4 mods loaded, 4 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.23.738} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.1.738} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FlansMod{2.3.1} [Flan's Mod] (Flans-Mod-1.5.2 (2).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: NVIDIA GeForce 9400M OpenGL Engine GL version 2.1 NVIDIA-1.6.36, 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: 47 (2632 bytes; 0 MB) allocated, 47 (2632 bytes; 0 MB) used

java.lang.NullPointerException
at net.minecraft.item.ItemStack.<init>(ItemStack.java:67)
at co.uk.flansmods.common.CreativeTabFlan.getIconItemStack(CreativeTabFlan.java:30)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_74233_a(GuiContainerCreative.java:905)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_74185_a(GuiContainerCreative.java:731)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:107)
at net.minecraft.client.renderer.InventoryEffectRenderer.func_73863_a(SourceFile:31)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_73863_a(GuiContainerCreative.java:664)
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(Thread.java:695)
--- END ERROR REPORT c819597e ----------

It's an error regarding one of the mods you installed. Re-Install all your mods and see if it fixes. Also, I noticed your playing 1.5.2. Make sure the versions of your mods are 1.5.2 as well.