Minecraft Forums

I've spent about 3 hours making my modpack, and I've got the basics down, but every time I try to log in, it crashes, leaving this message. (Don't have to read it all, skip to bottom.)

"---- Minecraft Crash Report ----
// I feel sad now

Time: 5/17/14 2:40 PM
Description: Initializing game

java.lang.IllegalArgumentException: Can not set static am2.AMCore field am2.AMCore.instance to atomicstryker.magicyarn.common.MagicYarn
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
at sun.reflect.UnsafeStaticObjectFieldAccessorImpl.set(Unknown Source)
at java.lang.reflect.Field.set(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.parseSimpleFieldAnnotation(FMLModContainer.java:449)
at cpw.mods.fml.common.FMLModContainer.processFieldAnnotations(FMLModContainer.java:382)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:525)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(Unknown Source)
at sun.reflect.UnsafeStaticObjectFieldAccessorImpl.set(Unknown Source)
at java.lang.reflect.Field.set(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.parseSimpleFieldAnnotation(FMLModContainer.java:449)
at cpw.mods.fml.common.FMLModContainer.processFieldAnnotations(FMLModContainer.java:382)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:525)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:201)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:112)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:511)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:183)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:473)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 103374712 bytes (98 MB) / 469237760 bytes (447 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
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 v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 55 mods loaded, 55 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed
AppliedEnergistics-Core{rv14.finale3} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems 1.6.1.9.jar) Unloaded->Constructed
OpenModsCore{0.4} [OpenModsCore] (minecraft.jar) Unloaded->Constructed
PowerCrystalsCore{1.1.8} [PowerCrystals Core] (PowerCrystalsCore-1.1.8-9.jar) Unloaded->Constructed
TConstruct-Preloader{0.0.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed
VeinMinerCore{0.12.1} [Vein Miner CoreMod] (minecraft.jar) Unloaded->Constructed
AppliedEnergistics{rv14.finale3} [Applied Energistics] (appeng-rv14-finale3-mc16x.jar) Unloaded->Constructed
BuildCraft|Core{4.2.2} [BuildCraft] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed
BuildCraft|Builders{4.2.2} [BC Builders] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed
BuildCraft|Energy{4.2.2} [BC Energy] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed
BuildCraft|Factory{4.2.2} [BC Factory] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed
BuildCraft|Transport{4.2.2} [BC Transport] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed
BuildCraft|Silicon{4.2.2} [BC Silicon] (buildcraft-A-1.6.4-4.2.2.jar) Unloaded->Constructed
CoFHCore{2.0.0.5} [CoFH Core] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed
CoFHLoot{2.0.0.5} [CoFH Loot] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed
CoFHMasquerade{2.0.0.5} [CoFH Masquerade] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed
CoFHSocial{2.0.0.5} [CoFH Social] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed
CoFHWorld{2.0.0.5} [CoFH World] (CoFHCore-2.0.0.5.jar) Unloaded->Constructed
ComputerCraft{1.63} [ComputerCraft] (ComputerCraft1.63.jar) Unloaded->Constructed
EnderStorage{1.4.3.6} [EnderStorage] (EnderStorage 1.4.3.6.jar) Unloaded->Constructed
ForgeMultipart{1.0.0.244} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed
ThermalExpansion{3.0.0.7} [Thermal Expansion] (ThermalExpansion-3.0.0.7.jar) Unloaded->Constructed
IC2{2.0.357-experimental} [IndustrialCraft 2] (industrialcraft-2_2.0.357-experimental.jar) Unloaded->Constructed
Forestry{2.3.1.1} [Forestry for Minecraft] (forestry-A-2.3.1.1.jar) Unloaded->Constructed
DartCraft{Beta 0.2.18} [DartCraft] (DartCraft Beta 0.2.18.jar) Unloaded->Constructed
EE3{0.1} [Equivalent Exchange 3] (EquivalentExchange3-1.6.4-0.1.140.jar) Unloaded->Constructed
GalacticraftCore{2.0.12} [Galacticraft Core] (Galacticraft-1.6.4-2.0.12.1010.jar) Unloaded->Constructed
arsmagica2{1.1.1c} [Ars Magica 2] (mods) Unloaded->Constructed
MagicYarn{1.0.9} [Magic Yarn] (mods) Unloaded->Errored
Morph{0.7.1} [Morph] (mods) Unloaded->Errored
Natura{2.1.14} [Natura] (Natura_mc1.6.X_2.1.14.jar) Unloaded->Constructed
NotEnoughCodecs{0.1} [NotEnoughCodecs] (NotEnoughCodecs-0.1.jar) Unloaded->Constructed
OpenMods{0.4} [OpenMods] (OpenModsLib-0.4b.jar) Unloaded->Constructed
ProjRed|Core{4.3.2.26} [ProjectRed] (ProjectRedBase-1.6.4-4.3.2.26.jar) Unloaded->Constructed
ProjRed|Transmission{4.3.2.26} [ProjectRed-Transmission] (ProjectRedIntegration-1.6.4-4.3.2.26.jar) Unloaded->Constructed
OpenPeripheralCore{0.3.3} [OpenPeripheralCore] (OpenPeripheralCore-0.3.3.jar) Unloaded->Constructed
OpenPeripheral{0.1.3} [OpenPeripheralAddons] (OpenPeripheralAddons-0.1.3.jar) Unloaded->Constructed
OpenBlocks{1.2.7} [OpenBlocks] (OpenBlocks-1.2.7.jar) Unloaded->Constructed
PowerConverters{1.5.1R2.3.2B1} [Power Converters] (PowerConverters.jar) Unloaded->Constructed
ProjRed|Transportation{4.3.2.26} [ProjectRed-Transportation] (ProjectRedMechanical-BETA-1.6.4-4.3.2.26.jar) Unloaded->Constructed
ProjRed|Exploration{4.3.2.26} [ProjectRed-Exploration] (ProjectRedWorld-1.6.4-4.3.2.26.jar) Unloaded->Constructed
TConstruct{1.6.X_1.5.5.7} [Tinkers' Construct] (TConstruct_mc1.6.4_1.5.5.7 (1).jar) Unloaded->Constructed
ProjRed|Compatibility{4.3.2.26} [ProjectRed-Compatibility] (ProjectRedCompat-1.6.4-4.3.2.26.jar) Unloaded->Constructed
ProjRed|Integration{4.3.2.26} [ProjectRed-Integration] (ProjectRedIntegration-1.6.4-4.3.2.26.jar) Unloaded->Constructed
ProjRed|Illumination{4.3.2.26} [ProjectRed-Illumination] (ProjectRedLighting-1.6.4-4.3.2.26.jar) Unloaded->Constructed
ProjRed|Expansion{4.3.2.26} [ProjectRed-Expansion] (ProjectRedMechanical-BETA-1.6.4-4.3.2.26.jar) Unloaded->Constructed
Redstone Arsenal{1.0.0.0} [Redstone Arsenal] (RedstoneArsenal-1.0.0.0.jar) Unloaded->Constructed
TMechworks{33.c001660} [Tinkers' Mechworks] (TMechworks_mc1.6.4_0.1.6.jar) Unloaded->Constructed
VeinMiner{0.12.1} [Vein Miner] (VeinMiner.0.12.1_MC1.6.jar) Unloaded->Constructed
McMultipart{1.0.0.244} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed
ForgeMicroblock{1.0.0.244} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.244.jar) Unloaded->Constructed
TConstruct Environment: Sane and ready for action. Bugs may be reported.
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 8400 GL version 4.2.12422 Compatibility Profile Context 13.152.0.0, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null"

There is clearly mods installed, but the only place I see error is after "Vec3 Pool Size: ~~ERROR~~"
Can anyone resolve this?

You have to be careful with modpacks. Some mods could be the wrong version, or some could collide in a negative way.

Modpacks often cause problems, if they are different versions, the modpack will not work. It also could be an issue if the mods require different programs to work (i.e. Forge Universal, Forge API, Forge Modloader, etc.).

Lol thanks, I thought I wouldn't get any responses.

Though, I did everything but couldn't manage it to get it to work. I looked for every trace of magic yarn, and redownloaded AM2, and still remains crashing. Can you spot anything else that might be causing crashes?