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I have a problam with my modded server I put here the crash report please help me because I really don't understand crash reports.

thanks for who will help me

the crash report:

---- Minecraft Crash Report ----
// You're mean.

Time: 20:50 08/02/15
Description: Exception in server tick loop

java.lang.IllegalArgumentException: Slot 4094 is already occupied by [email protected] when adding [email protected]
at net.minecraft.block.Block.<init>(Block.java:349)
at mekanism.common.block.BlockBasic.<init>(BlockBasic.java:80)
at mekanism.common.Mekanism.addBlocks(Mekanism.java:875)
at mekanism.common.Mekanism.init(Mekanism.java:1187)
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_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1927790416 bytes (1838 MB) / 2058878976 bytes (1963 MB) up to 2058878976 bytes (1963 MB)
JVM Flags: 2 total; -Xmx2048M -Xms2048M
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 51 mods loaded, 51 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{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems-1.6.4-1.6.1.9-universal.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
AppliedEnergistics{rv13.c} [Applied Energistics] (appeng-rv13-c-mc162.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Core{4.2.1} [BuildCraft] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
UniversalElectricity{3.1.0} [Universal Electricity] (Universal-Electricity-3.1.0.70-core.jar) Unloaded->Constructed->Pre-initialized->Initialized
CalclaviaCore{1.1.0} [CalclaviaCore] (Calclavia Core-1.1.0.56.jar) Unloaded->Constructed->Pre-initialized->Initialized
CoFHCore{2.0.0.b8a} [CoFH Core] (CoFHCore-2.0.0.b8a.jar) Unloaded->Constructed->Pre-initialized->Initialized
ThermalExpansion{3.0.0.b8} [Thermal Expansion] (ThermalExpansion-3.0.0.b8.jar) Unloaded->Constructed->Pre-initialized->Initialized
IC2{2.0.357-experimental} [IndustrialCraft 2] (industrialcraft-2_2.0.357-experimental.jar) Unloaded->Constructed->Pre-initialized->Initialized
AtomicScience{1.0.1} [Atomic Science] (Atomic-Science-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Builders{4.2.1} [BC Builders] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Energy{4.2.1} [BC Energy] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Factory{4.2.1} [BC Factory] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Transport{4.2.1} [BC Transport] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Silicon{4.2.1} [BC Silicon] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
CoFHLoot{2.0.0.b8a} [CoFH Loot] (CoFHCore-2.0.0.b8a.jar) Unloaded->Constructed->Pre-initialized->Initialized
CoFHMasquerade{2.0.0.b8a} [CoFH Masquerade] (CoFHCore-2.0.0.b8a.jar) Unloaded->Constructed->Pre-initialized->Initialized
CoFHSocial{2.0.0.b8a} [CoFH Social] (CoFHCore-2.0.0.b8a.jar) Unloaded->Constructed->Pre-initialized->Initialized
CoFHWorld{2.0.0.b8a} [CoFH World] (CoFHCore-2.0.0.b8a.jar) Unloaded->Constructed->Pre-initialized->Initialized
ComputerCraft{1.63} [ComputerCraft] (ComputerCraft1.63.jar) Unloaded->Constructed->Pre-initialized->Initialized
EnderStorage{1.4.3.6} [EnderStorage] (Ender-Storage-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
ExtraUtilities{1.0.1} [Extra Utilities] (extrautils-1.0.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
factorization{0.8.25} [Factorization] (Factorization-0.8.25.jar) Unloaded->Constructed->Pre-initialized->Initialized
factorization.misc{0.8.25} [Factorization Miscellaneous Nonsense] (Factorization-0.8.25.jar) Unloaded->Constructed->Pre-initialized->Initialized
factorization.notify{0.8.25} [Factorization Notification System] (Factorization-0.8.25.jar) Unloaded->Constructed->Pre-initialized->Initialized
factorization.dimensionalSlice{0.8.25} [Factorization Dimensional Slices] (Factorization-0.8.25.jar) Unloaded->Constructed->Pre-initialized->Initialized
Forestry{2.3.0.6} [Forestry for Minecraft] (forestry-A-2.3.0.6.jar) Unloaded->Constructed->Pre-initialized->Initialized
ICBM|Contraption{1.3.3} [ICBM] (ICBM_Contraption_v1.3.3.261.jar) Unloaded->Constructed->Pre-initialized->Initialized
ICBM|Sentry{1.3.3} [ICBM] (ICBM_Sentry_v1.3.3.261.jar) Unloaded->Constructed->Pre-initialized->Initialized
ICBM|Explosion{1.3.3} [ICBM] (ICBM_Explosion_v1.3.3.261.jar) Unloaded->Constructed->Pre-initialized->Initialized
iChunUtil{2.4.0} [iChunUtil] (iChunUtil2.4.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
inventorytweaks{1.56} [Inventory Tweaks] (InventoryTweaks-MC1.6.2-1.56-b77.jar) Unloaded->Constructed->Pre-initialized->Initialized
IronChest{5.4.1.649} [Iron Chest] (ironchest-universal-1.6.4-5.4.1.649.zip) Unloaded->Constructed->Pre-initialized->Initialized
Mekanism{6.0.5} [Mekanism] (Mekanism-6.0.5.46.jar) Unloaded->Constructed->Pre-initialized->Errored
MekanismGenerators{6.0.5} [MekanismGenerators] (MekanismGenerators-6.0.5.46.jar) Unloaded->Constructed->Pre-initialized->Errored
MekanismTools{6.0.5} [MekanismTools] (MekanismTools-6.0.5.46.jar) Unloaded->Constructed->Pre-initialized->Errored
numina{1.0} [numina] (numina-0.3.0.80.jar) Unloaded->Constructed->Pre-initialized->Initialized
powersuits{0.10.0-91} [MachineMuse's Modular Powersuits] (ModularPowersuits-1.6.4-0.10.0-91.jar) Unloaded->Constructed->Pre-initialized->Initialized
Morph{0.3.0} [Morph] (Morph-Beta-0.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
OpenMods{0.4} [OpenMods] (OpenModsLib-0.4b.jar) Unloaded->Constructed->Pre-initialized->Initialized
OpenBlocks{1.2.7} [OpenBlocks] (OpenBlocks-1.2.7.jar) Unloaded->Constructed->Pre-initialized->Initialized
ForgeMultipart{1.0.0.219} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized
TConstruct{1.6.X_1.5.4dev} [Tinkers' Construct] (TConstruct_mc1.6.4_1.5.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
McMultipart{1.0.0.219} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized
ForgeMicroblock{1.0.0.219} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.219.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)

java.lang.IllegalArgumentException: Slot 4094 is already occupied by [email protected] when adding [email protected]

Go into configs folder, and open config files for the two mods (extrautils and mekanism). You'll find the ID 4094 assigned in both to different things. Change it in one of the files to something else, that's not conflicting (it'll take trial and error on this part). save files. Try again.