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I have a few mods that you will be able to find on the crash report, and when I updated Ars Magica from 5.52.003 to 5.52.009, it came up with this crash message:

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 469133320 bytes (447 MB) / 659816448 bytes (629 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 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 v5.2.17.715 Minecraft Forge 7.8.0.715 16 mods loaded, 16 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML{5.2.17.715} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized
Forge{7.8.0.715} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized
CodeChickenCore{0.8.6.9} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized
NotEnoughItems{1.5.2.16} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized
mod_LiteLoaderForModLoader{1.5.2.7} [Mine Little Pony] (minecraft.jar) Unloaded->Constructed->Pre-initialized
ArsMagica{5.52.009} [Ars Magica] (ArsMagica_5.52.009.zip) Unloaded->Constructed->Pre-initialized
BiblioCraft{1.2.3} [BiblioCraft] (BiblioCraft[v1.2.3].zip) Unloaded->Constructed->Pre-initialized
BiomesOPlenty{0.5.3} [Biomes O' Plenty] (Biomes-O-Plenty-0.5.3.zip) Unloaded->Constructed->Pre-initialized
ChickenChunks{1.3.2.9} [ChickenChunks] (ChickenChunks 1.3.2.9.jar) Unloaded->Constructed->Pre-initialized
EE3{pre1h (build 16)} [Equivalent Exchange 3] (ee3-universal-pre1h-16.jar) Unloaded->Constructed->Pre-initialized
EnderStorage{1.4.2.8} [EnderStorage] (EnderStorage 1.4.2.8.jar) Unloaded->Constructed->Pre-initialized
Natura{1.5.1_2.0.21} [Natura] (Natura_2.0.21.jar) Unloaded->Constructed->Pre-initialized
TConstruct{1.5.1_1.3.3.14} [Tinkers' Construct] (TConstruct_1.3.3.15.jar) Unloaded->Constructed->Pre-initialized
Thaumcraft{3.0.5e} [Thaumcraft] (Thaumcraft3.0.5e.zip) Unloaded->Constructed->Pre-initialized
TwilightForest{1.18.1} [The Twilight Forest] (twilightforest-1.18.1.zip) Unloaded->Constructed->Pre-initialized
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 4600 Series GL version 3.3.9901 Compatibility Profile Context, ATI Technologies Inc.
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: ~~ERROR~~ NullPointerException: null

java.lang.NullPointerException
at mods.tinker.tconstruct.blocks.LiquidMetalBase.func_71858_a(LiquidMetalBase.java:73)
at mods.tinker.tconstruct.client.TClientEvents.postStitch(TClientEvents.java:47)
at net.minecraftforge.event.ASMEventHandler_42_TClientEvents_postStitch_Post.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35)
at net.minecraftforge.event.EventBus.post(EventBus.java:103)
at net.minecraftforge.client.ForgeHooksClient.onTextureStitchedPost(ForgeHooksClient.java:253)
at net.minecraft.client.renderer.texture.TextureMap.func_94247_b(TextureMap.java:205)
at mithion.arsmagica.guis.AMGuiIcons.init(AMGuiIcons.java:82)
at mithion.arsmagica.AMCore.RegisterTexture(AMCore.java:674)
at mithion.arsmagica.blocks.BlockEssenceRefiner.func_94332_a(BlockEssenceRefiner.java:90)
at net.minecraft.client.renderer.texture.TextureMap.func_94247_b(TextureMap.java:68)
at net.minecraft.client.renderer.RenderEngine.func_94152_c(RenderEngine.java:521)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:444)
at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:733)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 319d3ecb ----------

Halp?

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