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hello, im doing a modpack with some mods including the eternal frost mod, the server crashes when i open it and i know its because of the eternal frost (yes, i did put the assets folder in the server). can someone tell me how to fix it?

here is the crash report:

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

Time: 15:19 16/12/14
Description: Exception in server tick loop

java.lang.IllegalArgumentException: Slot 1482 is already occupied by [email protected] when adding [email protected]
at net.minecraft.block.Block.<init>(Block.java:349)
at net.minecraft.block.BlockStairs.<init>(SourceFile:37)
at EternalFrost.Blocks.BlockEFStairs.<init>(BlockEFStairs.java:40)
at EternalFrost.mod_EternalFrost.load(mod_EternalFrost.java:916)
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 cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:545)
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.initializeMods(Loader.java:699)
at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:107)
at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:355)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:142)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)


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

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_71, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 349856264 bytes (333 MB) / 471859200 bytes (450 MB) up to 1657274368 bytes (1580 MB)
JVM Flags: 0 total;
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 39 mods loaded, 39 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-universal-1.6.4-9.11.1.965-v164-pregradle.jar) Unloaded->Constructed->Pre-initialized->Initialized
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-universal-1.6.4-9.11.1.965-v164-pregradle.jar) Unloaded->Constructed->Pre-initialized->Initialized
AppliedEnergistics-Core{rv13.c} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
CodeChickenCore{0.9.0.7} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
OpenModsCore{0.4} [OpenModsCore] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
TConstruct-Preloader{0.0.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FamiliarsAPI{1.6.4} [Familiars API] (Familiars_API_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized
ExtraUtilities{1.0.3c} [Extra Utilities] (14138665605_extrautils-1.0.3c.zip) Unloaded->Constructed->Pre-initialized->Initialized
AnimationAPI{1.1.1} [AnimationAPI] (AnimationAPI-v1.1.1-mc1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
AppliedEnergistics{rv13.c} [Applied Energistics] (Applied-Energistics-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
ComputerCraft{1.63} [ComputerCraft] (ComputerCraft1.63.jar) Unloaded->Constructed->Pre-initialized->Initialized
DragonMounts{r36} [Dragon Mounts] (dragonmount_r36_mc1.6.x.zip) Unloaded->Constructed->Pre-initialized->Initialized
elementalswords{2.1.1} [Elemental Swords] (elementalswords-164-2115434789.zip) Unloaded->Constructed->Pre-initialized->Initialized
eplus{1.16.5b} [Enchanting Plus] (EnchantingPlus-1.16.5 (2).zip) Unloaded->Constructed->Pre-initialized->Initialized
eternalfrost{1.5b1} [Eternal Frost] (EternalFrost.zip) Unloaded->Constructed->Pre-initialized->Errored
FamiliarsDefaultMobPack{1.6.4} [Familiars DefaultMobPack] (Familiars_DefaultMobPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized
FamiliarsExtendedFamPack{1.6.4} [Familiars ExtendedFamPack] (Familiars_ExtendedFamPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized
FamiliarsHerobrineFamPack{1.6.4} [Familiars HerobrineFamPack] (Familiars_HerobrineFamPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized
GalacticraftCore{2.0.14} [Galacticraft Core] (Galacticraft-1.6.4-2.0.14.1097.jar) Unloaded->Constructed->Pre-initialized->Initialized
GalacticraftMars{2.0.14} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.14.1097.jar) Unloaded->Constructed->Pre-initialized->Initialized
iChunUtil{2.3.0} [iChunUtil] (iChunUtil2.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
GraviGun{2.0.0} [GraviGun] (GravityGun2.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
HardcoreEnderExpansion{1.3.1} [Hardcore Ender Expansion] (HardcoreEnderExpansion.zip) Unloaded->Constructed->Pre-initialized->Initialized
Hats{2.1.8} [Hats] (Hats2.1.8.zip) Unloaded->Constructed->Pre-initialized->Initialized
lucky{4.2.1} [Lucky Block] (Lucky-Block-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
battlegear2{1.0.4.8} [Mine & Blade Battlegear 2 - Bullseye] (Mine-Blade-Battlegear-2-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
AencEx{0.0.1} [AencEx] (More-Enchantments-Mod-1.6.4 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized
me{1.1.1} [More Enchantments] (More-Enchantments-Mod-1.6.4 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized
MutantCreatures{1.4.4} [Mutant Creatures] (Mutant_Creatures_v1.4.4_mc1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized
OpenMods{0.4} [OpenMods] (OpenModsLib-0.4b.jar) Unloaded->Constructed->Pre-initialized->Initialized
OpenPeripheralCore{0.3.3} [OpenPeripheralCore] (OpenPeripheralCore-0.3.3.jar) Unloaded->Constructed->Pre-initialized->Initialized
OpenPeripheral{0.1.3} [OpenPeripheralAddons] (OpenPeripheralAddons-0.1.3.jar) Unloaded->Constructed->Pre-initialized->Initialized
OpenBlocks{1.2.7} [OpenBlocks] (OpenBlocks-1.2.7.jar) Unloaded->Constructed->Pre-initialized->Initialized
DarrenPR_RottenFleshToLeather{1.0.0} [Rotten Flesh to Leather] (RottenFleshToLeather_1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized
StevesCarts{2.0.0.a132} [Steve's Carts 2] (Steves-Carts-2-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized
TConstruct{1.5.13EX} [Tinkers' Construct] (TConstruct_mc1.6.4_EX.30.jar) Unloaded->Constructed->Pre-initialized->Initialized
TwilightForest{1.20.3} [The Twilight Forest] (twilightforest-1.20.3.jar) Unloaded->Constructed->Pre-initialized->Initialized
TConstruct Environment: Sane and ready for action. Bugs may be reported.
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

You have an ID conflict. You need to go into the mods listed in the error (TC and EF) and change the IDs so they don't overlap.

Also, make sure all your mods are for 1.6.4. For example your animationAPI if for 1.5.1 and so on. I didn't check everything.

Quote from zohar101»

Also, make sure all your mods are for 1.6.4. For example your animationAPI if for 1.5.1 and so on. I didn't check everything.

i tried to download animationapi for 1.6.4 and it doesnt work. this one does in single player.

Then you need to report it to the author and say exactly what doesn't work and if you're getting any errors. Loading versions of mod designed for a different game version is just setting yourself up for major issues down the road. Up to you though.

But that's for when you have future issues. Your main/primary issue in this error report is ID conflict.

ok, i did it! everything works now! thanks!