The following error causes a CTD when attempting to load into a world:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 09/08/20 11:33 AM
Description: Unexpected error

java.lang.IllegalStateException: Already building!
at net.minecraft.client.renderer.BufferBuilder.func_181668_a(BufferBuilder.java:177) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.ItemRenderer.func_181565_a(ItemRenderer.java:336) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:quark:extract-item-color,xf:fml:quark:get-armor-color,xf:fml:quark:get-glint-color,xf:fml:quark:get-glint-direct-color,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.ItemRenderer.func_180453_a(ItemRenderer.java:310) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:quark:extract-item-color,xf:fml:quark:get-armor-color,xf:fml:quark:get-glint-color,xf:fml:quark:get-glint-direct-color,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.ItemRenderer.func_175030_a(ItemRenderer.java:286) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:quark:extract-item-color,xf:fml:quark:get-armor-color,xf:fml:quark:get-glint-color,xf:fml:quark:get-glint-direct-color,pl:runtimedistcleaner:A}
at blusunrize.immersiveengineering.client.ClientUtils.renderItemWithOverlayIntoGUI(ClientUtils.java:1279) ~[?:?] {re:classloading}
at blusunrize.immersiveengineering.client.ClientEventHandler.lambda$onRenderOverlayPost$3(ClientEventHandler.java:668) ~[?:?] {re:classloading}
at net.minecraftforge.common.util.LazyOptional.ifPresent(LazyOptional.java:161) ~[?:?] {re:classloading}
at blusunrize.immersiveengineering.client.ClientEventHandler.onRenderOverlayPost(ClientEventHandler.java:636) ~[?:?] {re:classloading}
at net.minecraftforge.eventbus.ASMEventHandler_982_ClientEventHandler_onRenderOverlayPost_Post.invoke(.dynamic) ~[?:?] {}
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-3.0.3-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:297) ~[eventbus-3.0.3-service.jar:?] {}
at net.minecraftforge.client.gui.ForgeIngameGui.post(ForgeIngameGui.java:832) ~[?:?] {re:classloading}
at net.minecraftforge.client.gui.ForgeIngameGui.renderHUDText(ForgeIngameGui.java:658) ~[?:?] {re:classloading}
at net.minecraftforge.client.gui.ForgeIngameGui.func_238445_a_(ForgeIngameGui.java:187) ~[?:?] {re:classloading}
at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:461) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:951) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:582) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:randompatches:RandomPatches Minecraft Transformer,pl:mixin:APP:assets/botania/botania.mixins.json:AccessorMinecraft,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:184) ~[1.16.1.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_242] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_242] {}
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51) ~[forge-1.16.1-32.0.106.jar:32.0] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-6.1.1.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-6.1.1.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-6.1.1.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-6.1.1.jar:?] {re:classloading}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-6.1.1.jar:?] {re:classloading}

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

-- Head --
Thread: Render thread
Stacktrace:
at net.minecraft.client.renderer.BufferBuilder.func_181668_a(BufferBuilder.java:177)
at net.minecraft.client.renderer.ItemRenderer.func_181565_a(ItemRenderer.java:336)
at net.minecraft.client.renderer.ItemRenderer.func_180453_a(ItemRenderer.java:310)
at net.minecraft.client.renderer.ItemRenderer.func_175030_a(ItemRenderer.java:286)
at blusunrize.immersiveengineering.client.ClientUtils.renderItemWithOverlayIntoGUI(ClientUtils.java:1279)
at blusunrize.immersiveengineering.client.ClientEventHandler.lambda$onRenderOverlayPost$3(ClientEventHandler.java:668)
at net.minecraftforge.common.util.LazyOptional.ifPresent(LazyOptional.java:161)
at blusunrize.immersiveengineering.client.ClientEventHandler.onRenderOverlayPost(ClientEventHandler.java:636)
at net.minecraftforge.eventbus.ASMEventHandler_982_ClientEventHandler_onRenderOverlayPost_Post.invoke(.dynamic)
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85)
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:297)
at net.minecraftforge.client.gui.ForgeIngameGui.post(ForgeIngameGui.java:832)
at net.minecraftforge.client.gui.ForgeIngameGui.renderHUDText(ForgeIngameGui.java:658)
at net.minecraftforge.client.gui.ForgeIngameGui.func_238445_a_(ForgeIngameGui.java:187)

-- Affected level --
Details:
All players: 1 total; [ClientPlayerEntity['blacknight100'/581, l='ClientLevel', x=-2056.93, y=101.00, z=-0.11]]
Chunk stats: Client Chunk Cache: 729, 441
Level dimension: minecraft:overworld
Level spawn location: World: (-188,63,-735), Chunk: (at 4,3,1 in -12,-46; contains blocks -192,0,-736 to -177,255,-721), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
Level time: 46540087 game time, 74296 day time
Server brand: forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.world.ClientWorld.func_72914_a(ClientWorld.java:446)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:1973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:603)
at net.minecraft.client.main.Main.main(Main.java:184)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:51)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

-- System Details --
Details:
Minecraft Version: 1.16.1
Minecraft Version ID: 1.16.1
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_242, AdoptOpenJDK
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode),
Memory: 717032792 bytes (683 MB) / 3710386176 bytes (3538 MB) up to 3817865216 bytes (3641 MB)
CPUs: 8
JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -Xms4096m -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms256m
ModLauncher: 6.1.1+74+master.966c698
ModLauncher launch target: fmlclient
ModLauncher naming: srg
ModLauncher services:
/mixin-0.8.jar mixin PLUGINSERVICE
/eventbus-3.0.3-service.jar eventbus PLUGINSERVICE
/forge-1.16.1-32.0.106.jar object_holder_definalize PLUGINSERVICE
/forge-1.16.1-32.0.106.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.2.0-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.16.1-32.0.106.jar capability_inject_definalize PLUGINSERVICE
/forge-1.16.1-32.0.106.jar runtimedistcleaner PLUGINSERVICE
/mixin-0.8.jar mixin TRANSFORMATIONSERVICE
/forge-1.16.1-32.0.106.jar fml TRANSFORMATIONSERVICE
FML: 32.0
Forge: net.minecraftforge:32.0.106
FML Language Providers:
[email protected]
minecraft@1
Mod List:
NetherPortalFix_1.16.1-7.0.0.jar NetherPortalFix {[email protected] DONE}
Variant16x-1.16-v0.15.3_beta.jar Variant16x {[email protected]_beta DONE}
vanillaboom-1.16.1-1.6.6.2-universal.jar Vanilla Boom {[email protected] DONE}
bambooeverything-1.16-1.0.0.jar Bamboo Everything {[email protected] DONE}
modnametooltip_1.16.1-1.14.0.jar Mod Name Tooltip {[email protected] DONE}
pitg-1.16.1-1.3.0.jar Pane In The Glass {[email protected] DONE}
noautojump-1.16.1-1.jar No Auto-Jump {[email protected] DONE}
Neat 1.7-23.jar Neat {[email protected] DONE}
BetterCaves-1.16.1-1.0.jar YUNG's Better Caves {[email protected] DONE}
ForgeEndertech-1.16.1-7.0.0.0-build.0006.jar Forge Endertech {[email protected] DONE}
XaerosWorldMap_1.8.1_Forge_1.16.1.jar Xaero's World Map {[email protected] DONE}
CookingForBlockheads_1.16.1-9.0.0.jar Cooking for Blockheads {[email protected] DONE}
Controlling-7.0.0.3.jar Controlling {[email protected] DONE}
Placebo-1.16.1-4.1.2.jar Placebo {[email protected] DONE}
citadel-1.2.0.jar Citadel {[email protected] DONE}
potionsmaster-0.1.13-1.16.1-32.0.97.jar Potions Master {[email protected] DONE}
Bookshelf-1.16.1-6.3.19.jar Bookshelf {[email protected] DONE}
guardvillagers-1.16.1-1.1.1.jar Guard Villagers {[email protected] DONE}
randompatches-1.16.1-1.22.1.1.jar RandomPatches {[email protected] DONE}
DarkUtilities-1.16.1-4.0.3.jar Dark Utilities {[email protected] DONE}
Apotheosis-1.16.1-4.0.0.jar Apotheosis {[email protected] DONE}
mcw-doors-1.0.0-mc1.16.1.jar Macaw's Doors {[email protected] DONE}
Morpheus-1.16.1-4.2.55.jar Morpheus {morpheus@version DONE}
MekanismGenerators-1.16.1-10.0.8.431.jar Mekanism: Generators {[email protected] DONE}
CauldronRecipes-1.16.1-2.0.3.jar CauldronRecipes {[email protected] DONE}
Ma-Essentials-1.16.1-3.2.4.jar Ma Essentials {[email protected] DONE}
TMechworks-1.16.1-2.2.1.jar Tinkers' Mechworks {[email protected] DONE}
JustEnoughResources-1.16.1-0.11.1.93.jar Just Enough Resources {[email protected] DONE}
MysticalAgradditions-1.16.1-4.0.0.jar Mystical Agradditions {[email protected] DONE}
refinedstorage-1.9.2.jar Refined Storage {[email protected] DONE}
w2w-1.16.1-0.0.4.0.jar w2w {w2w@NONE DONE}
structure-gel-api-1.16.1-1.1.1.jar Structure Gel API {[email protected] DONE}
mcw-bridges-1.0.4-mc1.16.1.jar Macaw's Bridges {[email protected] DONE}
repurposed_structures-1.16.1-2.0.4.jar Repurposed Structures {[email protected] DONE}
BiomesOPlenty-1.16.1-11.0.0.393-universal.jar Biomes O' Plenty {[email protected] DONE}
Variant16x-BiomesOPlenty-1.16.1-v0.15.3_beta.jar Variant16x: Biomes O' Plenty {[email protected]_beta DONE}
MekanismAdditions-1.16.1-10.0.8.431.jar Mekanism: Additions {[email protected] DONE}
valhelsia_structures-16.0.1.jar Valhelsia Structures {[email protected] DONE}
adventurepack-1.0.jar Adventure Tools {[email protected] DONE}
dungeons-plus-1.16.1-1.0.2.jar Dungeons Plus {[email protected] DONE}
mining_dimension-1.16.1-1.0.5.jar Mining World {[email protected] DONE}
curios-FORGE-1.16.1-3.0.0.2.jar Curios API {[email protected] DONE}
Curious+Armor+Stands-1.16.1-1.2.0.jar Curious Armor Stands {[email protected] DONE}
Botania-1.16-399.jar Botania {[email protected] DONE}
Patchouli-1.16-39.jar Patchouli {[email protected] DONE}
EndReborn+[0.7.5].jar End: Reborn {[email protected] DONE}
DrawersTooltip-1.16.1-2.0.1.jar Drawers Tooltip {[email protected] DONE}
EnigmaticLegacy-1.8.4.jar Enigmatic Legacy {[email protected] DONE}
worldedit-forge-mc1.16.1-7.2.0-beta-02.jar WorldEdit {[email protected]+d10d7d6 DONE}
MekanismTools-1.16.1-10.0.8.431.jar Mekanism: Tools {[email protected] DONE}
mcws-roofs-1.16.1-v2.0.0.jar Macaw's Roofs {[email protected] DONE}
curiouselytra-FORGE-1.16.1-3.0.jar Curious Elytra {[email protected] DONE}
cherishedworlds-FORGE-1.16.1-4.0.0.1.jar Cherished Worlds {[email protected] DONE}
cloth-config-forge-4.0.1.jar Cloth Config v4 API {[email protected] DONE}
tramplestopper-1.15.2-2.0.0.3-universal.jar Trample Stopper {[email protected] DONE}
InventoryEssentials_1.16.1-2.0.0.jar Inventory Essentials {[email protected] DONE}
woodcutter-1.2a-1.16.1.jar Wood Cutter {[email protected] DONE}
bwncr-1.16.1-3.6.15.jar Bad Wither No Cookie Reloaded {[email protected] DONE}
FastLeafDecay-v23.jar FastLeafDecay {fastleafdecay@v23 DONE}
PrettyBeaches_1.16.1-5.0.0.jar Pretty Beaches {[email protected] DONE}
BetterMineshaftsForge-1.16.1-1.3.jar YUNG's Better Mineshafts {[email protected] DONE}
BetterAdvancements-1.16.1-0.1.0.100.jar Better Advancements {[email protected] DONE}
dwarfcoal-1.16.1-1.2.jar Dwarf Coal {[email protected] DONE}
QuarkOddities-1.15.2.jar Quark Oddities {[email protected] DONE}
Ma-Enchants-1.16.1-3.2.1.jar Ma Enchants {[email protected] DONE}
Cucumber-1.16.1-4.0.0.jar Cucumber Library {[email protected] DONE}
TrashSlot_1.16.1-12.0.1.jar TrashSlot {[email protected] DONE}
torchslabmod-1.16.1_v1.6.16.jar Torch Slab Mod {[email protected] DONE}
mining-helmet-1.16.1-1.0.8.jar Mining Helmet {[email protected] DONE}
jei-1.16.1-7.0.1.9.jar Just Enough Items {[email protected] DONE}
JEIEnchantmentInfo-1.16.1-1.2.0.jar JEI Enchantment Info {[email protected] DONE}
metalbarrels-3.2b.jar Metal Barrels {[email protected] DONE}
Abnormals-Core-1.16.1-2.0.2.jar Abnormals Core {[email protected] DONE}
Buzzier-Bees-1.16.1-2.0.1.jar Buzzier Bees {[email protected] DONE}
Variant16x-BuzzierBees-1.16.1-v0.15.3_beta.jar Variant16x: Buzzier Bees {[email protected]_beta DONE}
Mekanism-1.16.1-10.0.8.431.jar Mekanism {[email protected] DONE}
caelus-FORGE-1.16.1-2.0-beta7.jar Caelus API {[email protected] DONE}
reap-1.16.1-1.0.2.jar Reap Mod {[email protected] DONE}
invtweaks-1.16.1-1.0.5.jar Inventory Tweaks Renewed {[email protected] DONE}
Waystones_1.16.1-7.0.2.jar Waystones {[email protected] DONE}
light-overlay-5.4.1.jar Light Overlay Forge {lightoverlay-forge@NONE DONE}
comforts-FORGE-1.16.1-3.0.jar Comforts {[email protected] DONE}
NaturesCompass-1.16.1-1.8.5.jar Nature's Compass {[email protected] DONE}
Artifacts-1.16.1-2.5.2.jar Artifacts {[email protected] DONE}
champions-FORGE-1.16.1-2.0-beta6.jar Champions {[email protected] DONE}
AdHooks-1.16.1-6.0.0.0-build.0006.jar Advanced Hook Launchers {[email protected] DONE}
DungeonCrawl-1.16.1-2.0.2.jar Dungeon Crawl {[email protected] DONE}
FarmingForBlockheads_1.16.1-7.0.1.jar Farming for Blockheads {[email protected] DONE}
pedestals-0.6a.jar Pedestals {[email protected] DONE}
additional_lights-1.16.1-2.1.1.jar Additional Lights {[email protected] DONE}
JEITweaker-1.16.1-1.0.1.2.jar JEI Tweaker {[email protected] DONE}
PackingTape-1.16.1-0.9.6.jar Packing Tape {[email protected] DONE}
CraftTweaker-1.16.1-7.0.0.23.jar CraftTweaker {[email protected] DONE}
forge-1.16.1-32.0.106-universal.jar Forge {[email protected] DONE}
Waddles-1.16.1-0.8.7.jar Waddles {[email protected] DONE}
MysticalAgriculture-1.16.1-4.0.1.jar Mystical Agriculture {[email protected] DONE}
ironchest-1.16.1-11.0.1.jar Iron Chests {[email protected] DONE}
CraftingTweaks_1.16.1-12.0.4.jar Crafting Tweaks {[email protected] DONE}
forge-1.16.1-32.0.106-client.jar Minecraft {[email protected] DONE}
theoneprobe-1.16-3.0.1-beta.jar The One Probe {[email protected] DONE}
MouseTweaks-2.13-mc1.16.1.jar Mouse Tweaks {[email protected] DONE}
ImmersiveEngineering-1.16.1-3.1-112.jar Immersive Engineering {[email protected] DONE}
morevanillalib-1.16.1-1.2.5.jar MoreVanillaLib {[email protected] DONE}
SaveYourPets-1.16.1-1.0.0.1.jar Save Your Pets {[email protected] DONE}
forbidden_arcanus-1.16.1-1.0.1.jar Forbidden & Arcanus {[email protected] DONE}
AdLods-1.16.1-4.0.0.0-build.0007.jar Large Ore Deposits {[email protected] DONE}
packedup-1.0.15-mc1.16.jar PackedUp {[email protected] DONE}
towers_of_the_wild-1.16.1-1.2.2.jar Towers Of the Wild {[email protected] DONE}
signedit-1.16.1-forge-1.jar SignEdit {signedit@NONE DONE}
Savage-and-Ravage-1.16.1-2.0.0.jar Savage & Ravage {[email protected] DONE}
Mantle-1.16.1-1.6.20.jar Mantle {[email protected] DONE}
Xaeros_Minimap_20.18.0.1_Forge_1.16.1.jar Xaero's Minimap {[email protected] DONE}
JAOPCA-1.16.1-3.3.0.3.jar JAOPCA {[email protected] DONE}
rats-6.0.5-1.16.1.jar Rats {[email protected] DONE}
pamhc2foodcore-1.16.1-1.0.5.jar Pam's HarvestCraft 2 Food Core {pamhc2foodcore@version DONE}
gravestone-1.16.1-1.0.6.jar Gravestone Mod {[email protected] DONE}
ftb-backups-2.1.1.5.jar FTB Utilities: Backups {[email protected] DONE}
FastWorkbench-1.16.1-4.2.0.jar FastWorkbench {[email protected] DONE}
AutoRegLib-1.6-43.jar AutoRegLib {[email protected] DONE}
Quark-r2.2-260.jar Quark {[email protected] DONE}
StorageDrawers-1.16.1-8.0.0.jar Storage Drawers {[email protected] DONE}
DoubleSlabs-1.16-3.3.3.jar Double Slabs {[email protected] DONE}
Regrowth-1.16.1-1.0.0.6.jar Regrowth Mod {[email protected] DONE}
IKnowWhatImDoing-3.0.1-forge.jar I Know What I'm Doing {iknowwhatimdoing@1 DONE}
structurize-0.13.43-ALPHA.jar Structurize {[email protected] DONE}
minecolonies-0.13.108-ALPHA-universal.jar Minecolonies {[email protected] DONE}
FastFurnace-1.16.1-4.1.0.jar FastFurnace {[email protected] DONE}
AppleSkin-mc1.16.1-forge-1.0.14.jar AppleSkin {[email protected] DONE}
Aquaculture-1.16.1-2.0.17.jar Aquaculture 2 {[email protected] DONE}
SoundFilters-0.14_for_1.16.jar Sound Filters {[email protected]_for_1.16 DONE}
DefaultOptions_1.16.1-12.0.1.jar Default Options {[email protected] DONE}
Patchouli open book context: n/a
Launched Version: 1.16.1
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce RTX 2080 Ti/PCIe/SSE2 GL version 4.6.0 NVIDIA 451.67, NVIDIA Corporation
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'forge'
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
CPU: 8x Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz

Appears to be a crash with Immersive Engineering.