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I have been trying to update my modpack to 12.17.0.1950+ but I seem to being seeing the same issue in all versions past 1949. Please let me know what you think and if there is a solution to this problem. Log output snipet: Bar Finished: ServerAboutToStart took 0.018s [18:54:25] [server thread/ERROR] [FML/]: Fatal errors were detected during the transition from AVAILABLE to SERVER_ABOUT_TO_START. Loading cannot continue [18:54:25] [server thread/ERROR] [FML/]: States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored UCHIJAA mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) UCHIJAA FML{8.0.99.99} [Forge Mod Loader] (modpack.jar) UCHIJEE Forge{12.17.0.1963} [Minecraft Forge] (modpack.jar) UCHIJAA OpenComputers|Core{1.6.0.1-beta.2} [OpenComputers (Core)] (minecraft.jar) UCHIJAA armorplus{2.4.1} [ArmorPlus] (ArmorPlus2.4.1(1.9.4).jar) UCHIJAA autopackager{1.6.2} [AutoPackager] (autopackager-1.6.2.jar) UCHIJAA bagginses{2.4.2} [bagginses] (Bagginses-1.9.4-2.4.2.jar) UCHIJEE Baubles{1.2.1.0} [baubles] (Baubles-1.9.4-1.2.1.0.jar) UCHIJEE baublesstuff{2.0.10} [baubles Stuff] (baublesstuff-2.0.10.jar) UCHIJAA bdlib{1.11.0.1} [bD Lib] (bdlib-1.11.0.1-mc1.9.4.jar) UCHIJEE BiomesOPlenty{4.1.0.2023} [biomes O' Plenty] (BiomesOPlenty-1.9.4-4.1.0.2023-universal.jar) UCHIJEE ExtraUtils2{1.0} [ExtraUtils2] (extrautils2-1.9.4-alpha-1.0.0a.jar) UCHIJEE JEI{3.6.3.212} [Just Enough Items] (jei_1.9.4-3.6.3.212.jar) UCHIJAA blockdrops{1.0.0} [block Drops] (Block Drops-1.9.4-1.0.0.jar) UCHIJEE BloodMagic{1.9.4-2.0.1-40} [blood Magic: Alchemical Wizardry] (BloodMagic-1.9.4-2.0.1-40.jar) UCHIJEE Botania{r1.8-308} [botania] (Botania-unofficial.r1.8-308.jar) UCHIJAA cavern{1.0.8} [Cavern] (Cavern_1.9.4-v1.0.8.jar) UCHIJAA Chameleon{1.9-2.1.4} [Chameleon] (Chameleon-1.9-2.1.4.jar) UCHIJEE chiselsandbits{10.2} [Chisels & Bits] (chiselsandbits-10.2.jar) UCHIJAA ChunkAnimator{1.1.1} [Chunk Animator] (ChunkAnimator-MC1.9.4-1.1.1.jar) UCHIJAA craftingtweaks{5.0.6} [Crafting Tweaks] (craftingtweaks-mc1.9.4-5.0.6.jar) UCHIJEE ElecCore{1.5.285} [ElecCore] (ElecCore-1.9.4-1.5.285.jar) UCHIJEE deepresonance{1.1.4beta32} [DeepResonance] (deepresonance-1.9.4-1.1.4beta32.jar) UCHIJAA DynamicLights{1.4.2} [Dynamic Lights] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_onFire{1.0.7} [Dynamic Lights Burning Entity Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_creepers{1.0.6} [Dynamic Lights Creeper Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_dropItems{1.1.0} [Dynamic Lights EntityItem Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_mobEquipment{1.1.0} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_flameArrows{1.0.1} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_floodLights{1.0.3} [Dynamic Lights Flood Light] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_otherPlayers{1.0.9} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.9.4.jar) UCHIJAA DynamicLights_thePlayer{1.1.3} [Dynamic Lights Player Light Module] (DynamicLights-1.9.4.jar) UCHIJAA EnderBags{2.0.1} [EnderBags] (EnderBags-1.9.4-2.0.0.jar) UCHIJAA endercore{1.9.4-0.4.0.21-alpha} [EnderCore] (EnderCore-1.9.4-0.4.0.21-alpha.jar) UCHIJEE endercrop{1.9-1.2-1836} [Ender Crop] (endercrop-1.9.4-1.3.1.jar) UCHIJEE Waila{1.7.0} [Waila] (Waila-1.7.0-B3_1.9.4.jar) UCHIJEE EnderIO{1.9.4-3.0.0.35_alpha} [Ender IO] (EnderIO-1.9.4-3.0.0.35_alpha.jar) UCHIJAA enderthing{0.6.7} [Enderthing] (enderthing-1.9.4-0.6.7.jar) UCHIJEE EnderZoo{1.9.4-1.2.2.40} [Ender Zoo] (EnderZoo-1.9.4-1.2.2.40.jar) UCHIJEE ExtraBitManipulation{1.9-2.1.2} [Extra Bit Manipulation] (ExtraBitManipulation-1.9.4-2.1.0.jar) UCHIJEE IC2{2.5.18-ex19} [industrialCraft 2] (industrialcraft-2-2.5.18-ex19.jar) UCHIJAA OpenComputers{1.6.0.1-beta.2} [OpenComputers] (OpenComputers-MC1.9.4-1.6.0.1-beta.2.jar) UCHIJAA FFS{1.9.4-1.5.5-b15} [Fancy Fluid Storage] (Fancy Fluid Storage-1.9.4-1.5.5-b15.jar) UCHIJAA fastleafdecay{1.6} [Fast Leaf Decay] (FastLeafDecay-MC1.9.4-1.7.jar) UCHIJEE forestry{5.0.12.149} [Forestry] (forestry_1.9.4-5.0.12.149.jar) UCHIJEE substratum{1.3.1.1} [substratum] (Substratum-1.9.4-1.3.1.1.jar) UCHIJEE foundry{2.0.0.0-alpha5} [Foundry] (Foundry-1.9.4-2.0.0.0-alpha5.jar) UCHIJAA furnus{1.80} [Furnus] (Furnus-1.9.4-1.80.jar) UCHIJEE gearswap{1.2.6} [Gear Swapper] (gearswap-1.9.4-1.2.6.jar) UCHIJAA advgenerators{0.9.20.1} [Advanced Generators] (generators-0.9.20.1-mc1.9.4.jar) UCHIJAA grapple_hooks{1.0.8} [Grapple Hooks] (GrappleHooks-1.9.4-1.0.8.jar) UCHIJEE guideBook{1.6} [Guide Book] (GuideBook-1.9.4-1.6a.jar) UCHIJAA hopperducts{1.4.7} [Hopper Ducts] (hopperducts-mc1.9.4-1.4.7.jar) UCHIJAA inventorysorter{0.9.0+40} [simple Inventory sorting] (inventorysorter-1.9.4-0.9.0+40.jar) UCHIJEE inventorytweaks{1.61-dev-53-0736dc3} [inventory Tweaks] (InventoryTweaks-1.61-dev-53.jar) UCHIJEE IronChest{6.0.141.782} [iron Chest] (ironchest-1.9.4-6.0.141.782.jar) UCHIJAA ifinder{1.0} [itemFinder] (ItemFinder-1.9.4-1.0.jar) UCHIJEE journeymap{1.9.4-5.2.0} [JourneyMap] (journeymap-1.9.4-5.2.0-unlimited.jar) UCHIJAA fyberbackpack{1.0.1} [Just Backpacks] (justbackpacks-mc1.9.4-1.0.1.jar) UCHIJAA jeresources{0.4.5.31} [Just Enough Resources] (JustEnoughResources-1.9.4-0.4.5.31.jar) UCHIJEE JET{2.1.32} [JustEnoughTooltips] (JustEnoughTooltips-1.9.4-2.1.32.jar) UCHIJAA llor{1.0.7-mc1.9.4} [Light Level Overlay Reloaded] (LLOverlayReloaded-1.0.7-mc1.9.4.jar) UCHIJEE LunatriusCore{1.1.2.35} [LunatriusCore] (LunatriusCore-1.9.4-1.1.2.35-universal.jar) UCHIJEE mantle{1.9.4-0.10.1.jenkins142} [Mantle] (Mantle-1.9.4-0.10.1.jenkins142.jar) UCHIJEE notenoughwands{1.3.4} [Not Enough Wands] (notenoughwands-1.9.4-1.3.4.jar) UCHIJAA ObsidianPlates{1.1.1} [Obsidian Plates] (ObsidianPlates-1.1.1_1.9.4.jar) UCHIJEE fodc{1.8.2} [Ore Dictionary Converter] (OreDictionaryConverter-1.8.2.jar) UCHIJAA progressiveautomation{1.6.46} [Progressive Automation] (ProgressiveAutomation-1.9.4-1.6.46.jar) UCHIJAA ProjectE{1.9.4-PE1.0.0B} [ProjectE] (ProjectE-1.9.4-PE1.0.0B.jar) UCHIJEE Psi{beta-33} [Psi] (Psi-beta-33.jar) UCHIJAA quantumflux{2.0.6} [QuantumFlux] (quantumflux-1.9.4-2.0.6.jar) UCHIJEE Quark{beta-21} [Quark] (Quark-beta-21.jar) UCHIJAA randomthings{3.7.3} [Random Things] (RandomThings-MC1.9.4-3.7.3.jar) UCHIJAA xreliquary{1.9.4-1.3.2.372} [Reliquary] (Reliquary-1.9.4-1.3.2.372.jar) UCHIJEE rftools{4.51} [RFTools] (rftools-1.9.4-4.51.jar) UCHIJEE rftoolsdim{4.23beta40} [RFTools Dimensions] (rftoolsdim-1.9.4-4.23beta40.jar) UCHIJAA Roguelike{1.5.2} [Roguelike Dungeons] (RoguelikeDungeons-1.9.4-1.5.2.jar) UCHIJAA AS_Ruins{16.1} [Ruins Spawning System] (Ruins-1.9.4.jar) UCHIJEE Schematica{1.7.8.147} [schematica] (Schematica-1.9.4-1.7.8.147-universal.jar) UCHIJAA shadowmc{3.3.6} [shadowMC] (ShadowMC-1.9.4-3.3.6.jar) UCHIJAA ShieldHider{1.0.1} [shield Hider] (ShieldHider-1.0.1_1.9.4.jar) UCHIJAA simpleretrogen{3.0.1+6} [simple Retrogen] (simpleretrogen-1.9.4-3.0.1+6.jar) UCHIJAA SleepingBag{1.2.0} [sleeping Bag] (SleepingBag-1.9.4-1.2.0.jar) UCHIJAA StorageDrawers{1.9-3.1.7} [storage Drawers] (StorageDrawers-1.9-3.1.7.jar) UCHIJEE tconstruct{1.9.4-2.3.1.jenkins229} [Tinkers' Construct] (TConstruct-1.9.4-2.3.1.jenkins229.jar) UCHIJEE theoneprobe{1.0.2} [The One Probe] (theoneprobe-1.9.4-1.0.2.jar) UCHIJEE TinkersAddons{1.0.1} [Tinkers' Addons] (Tinkers' Addons-1.9.4-1.0.1.jar) UCHIJAA tombmanygraves{1.9.4-2.0.2} [Tomb Many Graves] (TombManyGraves-1.9.4-2.0.2.jar) UCHIJAA torcharrowsmod{1.9.4-2} [TorchArrowsMod] (torcharrows-1.9.4-2.jar) UCHIJAA torcherino{1.9.4-2.4.0} [Torcherino] (Torcherino-TehNut-1.9.4-2.4.0.jar) UCHIJAA WailaHarvestability{1.1.7} [Waila Harvestability] (WailaHarvestability-mc1.9-1.1.7.jar) UCHIJAA ZDoctorBB{1.1} [blood Baubles] (ZDoctorBB-1.1.jar) [18:54:25] [server thread/ERROR] [FML/]: The following problems were captured during this phase [18:54:25] [server thread/ERROR] [FML/]: Caught exception from Forge java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.TimSort.mergeLo(Unknown Source) ~[?:1.8.0_91] at java.util.TimSort.mergeAt(Unknown Source) ~[?:1.8.0_91] at java.util.TimSort.mergeCollapse(Unknown Source) ~[?:1.8.0_91] at java.util.TimSort.sort(Unknown Source) ~[?:1.8.0_91] at java.util.Arrays.sort(Unknown Source) ~[?:1.8.0_91] at java.util.ArrayList.sort(Unknown Source) ~[?:1.8.0_91] at java.util.Collections.sort(Unknown Source) ~[?:1.8.0_91] at net.minecraftforge.oredict.RecipeSorter.sortCraftManager(RecipeSorter.java:154) ~[modpack.jar:?] at net.minecraftforge.common.ForgeModContainer.onAvailable(ForgeModContainer.java:409) ~[modpack.jar:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?] at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?] at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:228) ~[LoadController.class:?] at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:206) ~[LoadController.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?] at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?] at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:135) ~[LoadController.class:?] at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:775) ~[Loader.class:?] at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:316) ~[FMLClientHandler.class:?] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:518) ~[bcd.class:?] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349) ~[bcd.class:?] at net.minecraft.client.main.Main.main(SourceFile:124) ~[minecraft.jar:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) ~[launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) ~[launchwrapper-1.12.jar:?] [18:54:25] [server thread/ERROR] [FML/]: A fatal exception occurred during the server about to start event java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.TimSort.mergeLo(Unknown Source) ~[?:1.8.0_91] at java.util.TimSort.mergeAt(Unknown Source) ~[?:1.8.0_91] at java.util.TimSort.mergeCollapse(Unknown Source) ~[?:1.8.0_91] at java.util.TimSort.sort(Unknown Source) ~[?:1.8.0_91] at java.util.Arrays.sort(Unknown Source) ~[?:1.8.0_91] at java.util.ArrayList.sort(Unknown Source) ~[?:1.8.0_91] at java.util.Collections.sort(Unknown Source) ~[?:1.8.0_91] at net.minecraftforge.oredict.RecipeSorter.sortCraftManager(RecipeSorter.java:154) ~[modpack.jar:?] at net.minecraftforge.common.ForgeModContainer.onAvailable(ForgeModContainer.java:409) ~[modpack.jar:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?] at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?] at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:228) ~[LoadController.class:?] at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:206) ~[LoadController.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[guava-17.0.jar:?] at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[guava-17.0.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[guava-17.0.jar:?] at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:135) ~[LoadController.class:?] at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:775) ~[Loader.class:?] at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:316) ~[FMLClientHandler.class:?] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:518) ~[bcd.class:?] at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:349) ~[bcd.class:?] at net.minecraft.client.main.Main.main(SourceFile:124) ~[minecraft.jar:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_91] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) ~[launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) ~[launchwrapper-1.12.jar:?] [18:54:25] [server thread/DEBUG] [FML/]: Reverting to frozen data state. [18:54:25] [server thread/TRACE] [mcp/mcp]: Sending event FMLModIdMappingEvent to mod mcp

You get the item model to work by creating a <blockname>.json in models/item. Think of it as when you place your block in the world it is a block, but when it is in your inventory it is actually an item. { "parent": "<modname>:block/<blockname>", "display": { "thirdperson": { "rotation": [ 10, -45, 170 ], "translation": [ 0, 1.5, -2.75 ], "scale": [ 0.375, 0.375, 0.375 ] } } }