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I am trying to load a bunch of mods because I know it is doable due to large scale volume modpacks and while I was running some mods I ran into this issue.

java.lang.IllegalArgumentException: Failed to register dimension for id 20, One is already registered
at net.minecraftforge.common.DimensionManager.registerDimension(DimensionManager.java:127)
at biomesoplenty.BiomesOPlenty.load(BiomesOPlenty.java:128)
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.GeneratedMethodAccessor3.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.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:249)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:509)
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:

I am going to guess like block ids there is a way to manual assign dimensional ids as well correct?

Side note - I am just starting modding.

So what was wrong? It would be nice if you posted your fix.

Just wear a net condom such as ad block plus and don't use google chrome because of mass security leaks. I reccomend if you "need chrome" use comodo dragon.

Treecapitator has features in the config file. You should look at it. Also how big are you attempting to make your world? What forge version are you using?

If you have more then 70 mods you will get a conflict at some point. The max mods I had working were 102 and even that was a struggle.

Are these mods 1.6.4 or 1.6.2?

I am fairly new to making or fixing mods. for id issues I am using IDfixminus as far as the mods directory goes here[1.6.4]FloatingRuins.Forge.1.6.4.r02.Universal.zip
[1.6.4-Forge9.11.1.953][SMP][1.6.4]Schematica.jar
[1.6.4-Forge9.11.1.953][SMP][Dependencies][Tested]AnimationAPIv1.1.2mc1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][AdditionalVanillaToolsExPk]ExtendedWorkbenchv1.1.10.3.jar
[1.6.4-Forge9.11.1.953][SMP][Tested][BatsDropModifier]BatsDropLeather_v5.0[DevMorpheusZero].jar
[1.6.4-Forge9.11.1.953][SMP][Tested][BiomesGenerationModifier]BWG4_V119.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][CreeperAIandPhysicsModifier]CreepersNoCreeping_7.0[DevMorpheusZero].jar
[1.6.4-Forge9.11.1.953][SMP][Tested][CropsandFoodExPk]Pam'sHarvestCraftv1.1.4.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][DamageCalculatorVisuals]DamageIndicatorsv2.9.2.1.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][DependenciesforMorpheusZeroMods]MorphCore_v2.0.jar
[1.6.4-Forge9.11.1.953][SMP][Tested][Dependencies]bspkrsCorev5.2.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][DungeonStructureGeneration]DungeonPack.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][GameplayModifier]MoreHealthEnhanced5.0Universal.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][ItemUseManager]AutoSwitch-v4.2.0-mc1.6.4.jar
[1.6.4-Forge9.11.1.953][SMP][Tested][ItemUseManager]ThebombzenAPI-v2.2.0.jar
[1.6.4-Forge9.11.1.953][SMP][Tested][MultipleBiomesExPk]BiomesOPlenty-1.2.1.416.jar
[1.6.4-Forge9.11.1.953][SMP][Tested][MultipleBiomesExPk]ExtrabiomesXL-universal-3.14.5.jar
[1.6.4-Forge9.11.1.953][SMP][Tested][NewCharacterManager]StartingInventoryr03.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][SpiderNpcExPk]1.8OreSpiders.odt
[1.6.4-Forge9.11.1.953][SMP][Tested][SpiderNpcExPk]1.8OreSpiders.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][TreeHavestingPhysicsModifier]LumberJack.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][TreeLeafTool]Leafcutter_b2.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][TropicalBiomeExPk]Tropicraftv5.1.6.zip
[1.6.4-Forge9.11.1.953][SMP][Tested][WeatherEnhancement]BetterSnow.zip
[1.6.4-Forge9.11.1.953][SMP][Tested]BetterBreeds1.6.4v5.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][AdditionalDrops]haggismod-1.2.4.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][ArmorExPk]BasicArmormod1.6(v1.5).zip
[1.6.4-Forge9.11.1.953][SMP][Untested][DemensionalTravel]twilightforest-1.20.3.jar
[1.6.4-Forge9.11.1.953][SMP][Untested][Dependencies]MobiusCore_1.0.4.jar
[1.6.4-Forge9.11.1.953][SMP][Untested][Dependencies]RenderPlayerAPIforge1.0.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][Dependencies]SpaceCore0.5.3.jar
[1.6.4-Forge9.11.1.953][SMP][Untested][DependencyforReikasMods]DragonAPI1.6v11.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][DungeonGenerator]roguelike_v1.2.7.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][DungeonStructureGeneration]BattleTowers.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][DungeonStructureGeneration]BetterDungeons_2.05[DevChocolatin].odt
[1.6.4-Forge9.11.1.953][SMP][Untested][DungeonStructureGeneration]BetterDungeons_2.05[DevChocolatin].zip
[1.6.4-Forge9.11.1.953][SMP][Untested][GoblinThemed-CreaturesandItemsExPk]GoblinsModV5.1.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][MultipleTypesOfGlassBlocks]GlowGlass1.2.jar
[1.6.4-Forge9.11.1.953][SMP][Untested][NetherBiomeExPk]NetherX1.2.jar
[1.6.4-Forge9.11.1.953][SMP][Untested][PhysicandGenerationModifier]Natura_2.1.14.jar
[1.6.4-Forge9.11.1.953][SMP][Untested][StorageandMaterialAutomation]JABBA_1.0.3.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][SurvivalGear]RopePlus.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][SurvivalItemTeleporter]CrystalWing_r04.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][ToolsExPk]EverlastingTools1.0.2.zip
[1.6.4-Forge9.11.1.953][SMP][Untested][WingsandFlying]SurvivalWings1.2.3.zip
[1.6.4-Forge9.11.1.953][SMP]BigTreesForge-164.zip
[1.6.4-Forge9.11.1.953][SMP]butterflymania[1.6.4]_universal_v0.9.3.zip
[1.6.4-Forge9.11.1.953][SMP]CampCraftBasev4.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]CampCraftTentsv4.6.5.zip
[1.6.4-Forge9.11.1.953][SMP]Elementals1.0.0.jar
[1.6.4-Forge9.11.1.953][SMP]forestry-A-2.3.1.0.jar
[1.6.4-Forge9.11.1.953][SMP]Guardsmodv1.2.zip
[1.6.4-Forge9.11.1.953][SMP]LightbridgesanddoorsV1.7.zip
[1.6.4-Forge9.11.1.953][SMP]magical_crops_1.6.4_3.1.4.zip
[1.6.4-Forge9.11.1.953][SMP]MinersDeluxe-v2.2.4.zip
[1.6.4-Forge9.11.1.953][SMP]moChickens1.6.4V1.2.1.zip
[1.6.4-Forge9.11.1.953][SMP]MoreNature.zip
[1.6.4-Forge9.11.1.953][SMP]MoreCows_X-Mas.jar
[1.6.4-Forge9.11.1.953][SMP]Netherrocksv1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]Oceancraftv1.2.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sDesertCraft1.6.4v1.01.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sExtendedGlass1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sGetalltheSeeds1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sHugeMushroomSpawn1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sMelonSpawn1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sMobDropCrops1.6.4v1.02.zip
[1.6.4-Forge9.11.1.953][SMP]Pam'sTemperatePlants1.6.4.zip
[1.6.4-Forge9.11.1.953][SMP]RancraftPengForge_v164o2.zip
[1.6.4-Forge9.11.1.953][SMP]SimpleOres2+Pluginsv1.2.1.zip
[1.6.4-Forge9.11.1.953][SP][Tested][Dependencies][IdAutoFix]idfixminus-1.0.0.jar
[1.6.4-Forge9.11.1.953][SP][Tested][FrameandGameSpeedImprovement]FpsPlus1.6.4_v2.zip
[1.6.4-Forge9.11.1.953][SP][Tested][GUIEnhancement]mapwriter-2.0.16.zip
[1.6.4-Forge9.11.1.953][SP][Tested][HealthExpansion]HeartCrystal1.0.zip
[1.6.4-Forge9.11.1.953][SP][Tested][InterfaceModifier]CraftGuide-1.6.7.4.zip
[1.6.4-Forge9.11.1.953][SP][Tested][TextVisualsModifier]BetterFonts1.0.3.jar

java.lang.IllegalArgumentException: Slot 1700 is already occupied by nolan.os.blocks.RedstoneAir@3f4a405f when adding awesomemancam.minersdeluxe.block.BurningDiamondOre@23c83d6f

Bump - This is a sweet mod.