java.lang.NullPointerException: null key in entry: null=10
at com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:32) ~[guava-21.0.jar:?] {}
at com.google.common.collect.SingletonImmutableBiMap.(SingletonImmutableBiMap.java:42) ~[guava-21.0.jar:?] {}
at com.google.common.collect.ImmutableBiMap.of(ImmutableBiMap.java:73) ~[guava-21.0.jar:?] {}
at com.google.common.collect.ImmutableMap.of(ImmutableMap.java:120) ~[guava-21.0.jar:?] {}
at shadows.apotheosis.ench.objects.ItemHellBookshelf.func_150895_a(ItemHellBookshelf.java:47) ~[?:3.0.7] {re:classloading}
at net.minecraft.client.Minecraft.func_193986_ar(Minecraft.java:597) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:randompatches:RandomPatches Minecraft Transformer,xf:fml:shouldersurfing:coremodone,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.(Minecraft.java:435) [?:?] {re:classloading,pl:accesstransformer:B,xf:fml:randompatches:RandomPatches Minecraft Transformer,xf:fml:shouldersurfing:coremodone,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(SourceFile:166) [?:?] {re:classloading}
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] {}
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] {}
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] {}
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) [forge-1.15.2-31.1.25.jar:31.1] {}
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$464/1063823352.call(Unknown Source) [forge-1.15.2-31.1.25.jar:31.1] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?] {re:classloading}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.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 com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:32)
at com.google.common.collect.SingletonImmutableBiMap.(SingletonImmutableBiMap.java:42)
at com.google.common.collect.ImmutableBiMap.of(ImmutableBiMap.java:73)
at com.google.common.collect.ImmutableMap.of(ImmutableMap.java:120)
at shadows.apotheosis.ench.objects.ItemHellBookshelf.func_150895_a(ItemHellBookshelf.java:47)
at net.minecraft.client.Minecraft.func_193986_ar(Minecraft.java:597)
at net.minecraft.client.Minecraft.(Minecraft.java:435)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.main.Main.main(SourceFile:166)
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:497)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$464/1063823352.call(Unknown Source)
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: 1.15.2
Minecraft Version ID: 1.15.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 4358268640 bytes (4156 MB) / 5368709120 bytes (5120 MB) up to 5368709120 bytes (5120 MB)
CPUs: 4
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx5G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
ModLauncher: 5.0.0-milestone.4+67+b1a340b
ModLauncher launch target: fmlclient
ModLauncher naming: srg
ModLauncher services:
/eventbus-2.0.0-milestone.1-service.jar eventbus PLUGINSERVICE
/forge-1.15.2-31.1.25.jar object_holder_definalize PLUGINSERVICE
/forge-1.15.2-31.1.25.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.0.4-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.15.2-31.1.25.jar capability_inject_definalize PLUGINSERVICE
/forge-1.15.2-31.1.25.jar runtimedistcleaner PLUGINSERVICE
/forge-1.15.2-31.1.25.jar fml TRANSFORMATIONSERVICE
/MixinBootstrap-1.0.2%20(2).jar mixinbootstrap TRANSFORMATIONSERVICE
/MixinBootstrap-1.0.2%20(2).jar mixin PLUGINSERVICE
/MixinBootstrap-1.0.2%20(2).jar mixinbootstrap PLUGINSERVICE
FML: 31.1
Forge: net.minecraftforge:31.1.25
FML Language Providers:
[email protected]
minecraft@1
[email protected]
Mod List:
followingvillagers-1.15.2-1.4.0.jar Following Villagers {[email protected] LOAD_REGISTRIES}
SlimyBoyos-2.0.0.jar SlimyBoyos {[email protected] LOAD_REGISTRIES}
dotHack-Weapons-1.15.2-1.3.0.jar dotHack Weapons {[email protected] ERROR}
zombiehs_1.15.2-2.1.2.jar Zombie Horse Spawn {[email protected] LOAD_REGISTRIES}
prefab-1.5.0.1.jar Prefab {[email protected] LOAD_REGISTRIES}
KleeSlabs_1.15.2-8.0.0.jar KleeSlabs {[email protected] LOAD_REGISTRIES}
timber-1.15.2-1.5.jar Timber Mod {[email protected] LOAD_REGISTRIES}
softerhayb_1.15.2-1.0.jar Softer Hay Bales {[email protected] LOAD_REGISTRIES}
BetterTitleScreen-1.15.2-1.9.jar Better Title Screen {[email protected] LOAD_REGISTRIES}
JRFTL+[1.15.2]-1.1.jar JRFTL {[email protected] LOAD_REGISTRIES}
Controlling-6.1.1.jar Controlling {[email protected] LOAD_REGISTRIES}
BetterSprinting-1.15.2-v3.1.0.jar Better Sprinting {[email protected] LOAD_REGISTRIES}
Placebo-1.15.2-3.0.2.jar Placebo {[email protected] LOAD_REGISTRIES}
sneakthroughberries-1.15.2-20w06a-1.0.1.jar Sneak Through Berries {[email protected] LOAD_REGISTRIES}
edibleglowst_1.15.2-1.0.jar Edible Glowstone {[email protected] LOAD_REGISTRIES}
u_team_core-1.15.2-2.11.0.156.jar U Team Core {[email protected] LOAD_REGISTRIES}
randompatches-1.15.2-1.21.1.1.jar RandomPatches {[email protected] LOAD_REGISTRIES}
cryingghasts_1.15.2-1.0.jar Crying Ghasts {[email protected] LOAD_REGISTRIES}
Apotheosis-1.15.2-3.0.7.jar Apotheosis {[email protected] LOAD_REGISTRIES}
Waddles-1.15.2-0.8.5.jar Waddles {[email protected] LOAD_REGISTRIES}
MekanismGenerators-1.15.2-9.9.16.408.jar Mekanism: Generators {[email protected] LOAD_REGISTRIES}
ExpOreMod-1.15.2-1.1.jar Exp Ore Block {[email protected] LOAD_REGISTRIES}
EE+-+2.0.jar Extra Enrichments {[email protected] LOAD_REGISTRIES}
w2w-1.15.2-0.0.0.1.jar w2w {w2w@NONE LOAD_REGISTRIES}
anviltweaks-2.2a.jar Anvil Tweaks {[email protected] LOAD_REGISTRIES}
mcw-bridges-1.0.4fix-mc1.15.2.jar Macaw's Bridges {[email protected] LOAD_REGISTRIES}
useful_backpacks-1.15.2-1.9.4.63.jar Useful Backpacks {[email protected] LOAD_REGISTRIES}
repurposedstructures-1.15.2-1.1.0.jar Repurposed Structures {[email protected] LOAD_REGISTRIES}
AmbientSounds_v3.0.18_mc1.15.2.jar Ambient Sounds {[email protected] LOAD_REGISTRIES}
BiomesOPlenty-1.15.2-10.0.0.352-universal.jar Biomes O' Plenty {[email protected] LOAD_REGISTRIES}
phosphor-mc1.15.2-forge-0.4.2-rc2.jar Phosphor {[email protected] LOAD_REGISTRIES}
MekanismAdditions-1.15.2-9.9.16.408.jar Mekanism: Additions {[email protected] LOAD_REGISTRIES}
Blur-1.1.0-1.jar Blur {[email protected] LOAD_REGISTRIES}
valhelsia_structures-15.0.2.jar Valhelsia Structures {[email protected] LOAD_REGISTRIES}
invtotem_1.15.2-1.0.jar Inventory Totem {[email protected] LOAD_REGISTRIES}
mining_dimension-1.15.2-1.0.1.jar Mining World {[email protected] LOAD_REGISTRIES}
AzureRPGItems+1.15.2-1.3.2.jar Azure RPG Items {[email protected] LOAD_REGISTRIES}
lycanitesmobs-1.15.2-2.2.2.1.jar Lycanites Mobs {[email protected] LOAD_REGISTRIES}
curios-FORGE-1.15.2-2.0.2.jar Curios API {[email protected] LOAD_REGISTRIES}
carrotslib-mc1.15.2-2.5b1.jar Carrots Lib {[email protected] LOAD_REGISTRIES}
vanillafoodpantry-mc1.15.2-5.5b1.jar Vanilla Food Pantry {[email protected] LOAD_REGISTRIES}
rndbmflowers_1.15-1.1.jar Random Bone Meal Flowers {[email protected] LOAD_REGISTRIES}
Clay+WorldGen-1.1.0-1.15.1.jar Clay WorldGen {clayworldgen@version LOAD_REGISTRIES}
extlights-2.0.jar Extended Lights {[email protected] LOAD_REGISTRIES}
lostcities-1.15-3.0.1-alpha.jar LostCities {[email protected] LOAD_REGISTRIES}
tombstone-4.3.0-1.15.2.jar Corail Tombstone {[email protected] LOAD_REGISTRIES}
furniture-7.0.0-pre16-1.15.1.jar MrCrayfish's Furniture Mod {[email protected] LOAD_REGISTRIES}
bwncr-1.15.1-3.6.13.jar Bad Wither No Cookie Reloaded {[email protected] LOAD_REGISTRIES}
FastLeafDecay-v20.jar FastLeafDecay {fastleafdecay@v20 LOAD_REGISTRIES}
BetterAdvancements-1.15.2-0.1.0.96.jar Better Advancements {[email protected] LOAD_REGISTRIES}
doubledoors_1.15.2-1.2.jar Double Doors {[email protected] LOAD_REGISTRIES}
EquipmentTooltips-1.15.2-1.4.0+11.jar Equipment Tooltips {[email protected]+11 LOAD_REGISTRIES}
mining-helmet-1.15.2-1.0.7.jar Mining Helmet {[email protected] LOAD_REGISTRIES}
Mine+and+Slash-1.15.2-3.4.0.jar Mine and Slash {[email protected] LOAD_REGISTRIES}
jei-1.15.2-6.0.0.2.jar Just Enough Items {[email protected] LOAD_REGISTRIES}
lithium-mc1.15.2-forge-0.4.6-rc3-mod.jar Lithium {[email protected] LOAD_REGISTRIES}
buzzierbees-1.3.jar Buzzier Bees {[email protected] LOAD_REGISTRIES}
AttributeFix-1.15.2-7.0.1.jar AttributeFix {[email protected] LOAD_REGISTRIES}
Realistic+Ulities+4.1.1.jar Realistic Ulities {[email protected] LOAD_REGISTRIES}
goblintraders-1.2.0-1.15.2.jar Goblin Traders {[email protected] LOAD_REGISTRIES}
Mekanism-1.15.2-9.9.16.408.jar Mekanism {[email protected] LOAD_REGISTRIES}
bloomful-1.15.2-1.3.1.jar Bloomful {bloomful@NONE LOAD_REGISTRIES}
skeletonhs_1.15.2-1.1.2.jar Skeleton Horse Spawn {[email protected] LOAD_REGISTRIES}
extraboats-1.3.0-1.15.2.jar Extra Boats {[email protected] LOAD_REGISTRIES}
MS+Auto-Compat-1.15.2-1.2.0.jar M&S Auto-Compat 1.15.1 {[email protected] LOAD_REGISTRIES}
Waystones_1.15.2-6.0.1.jar Waystones {[email protected] LOAD_REGISTRIES}
MoreOresInONE-1.1_1.15.2.jar More Ores in ONE {[email protected] LOAD_REGISTRIES}
Clumps-5.0.2.jar Clumps {[email protected] LOAD_REGISTRIES}
journeymap-1.15.2-5.7.0beta1.jar Journeymap {[email protected] LOAD_REGISTRIES}
NaturesCompass-1.15.2-1.8.5.jar Nature's Compass {[email protected] LOAD_REGISTRIES}
SereneSeasons-1.15.2-3.0.0.68-universal.jar Serene Seasons {[email protected] LOAD_REGISTRIES}
DungeonCrawl-1.15.2-1.6.3.jar Dungeon Crawl {[email protected] LOAD_REGISTRIES}
FarmingForBlockheads_1.15.2-6.1.0.jar Farming for Blockheads {[email protected] LOAD_REGISTRIES}
nhacampfire_1.15.2-1.5.jar No Hostiles Around Campfire {[email protected] LOAD_REGISTRIES}
permasomnia_v1.1.1_formc1.15.2.jar Permasomnia {[email protected] LOAD_REGISTRIES}
mapperbase-1.15.2-1.0.0.0.jar Mapper Base {[email protected] LOAD_REGISTRIES}
bedspreads-FORGE-1.15.2-3.0.jar Bedspreads {[email protected] LOAD_REGISTRIES}
edibmagmac_1.15.2-1.0.jar Edible Magma Cream {[email protected] LOAD_REGISTRIES}
ToastControl-1.15.2-3.0.1.jar Toast Control {[email protected] LOAD_REGISTRIES}
dismounte_1.15-1.1.jar Dismount Entity {[email protected] LOAD_REGISTRIES}
endercompass-2.0.jar Ender Compass {[email protected] LOAD_REGISTRIES}
swampexpansion-1.15.2-1.5.jar Swamp Expansion {swampexpansion@NONE LOAD_REGISTRIES}
forge-1.15.2-31.1.25-universal.jar Forge {[email protected] LOAD_REGISTRIES}
Bountiful-3.0.0-1.15.2.jar Bountiful {[email protected] LOAD_REGISTRIES}
goprone-1.15.x-1.1.1.jar GoProne {[email protected] LOAD_REGISTRIES}
[Forge]+[1.15.2]+GamemodeOverhaul-1.15.2-1.4.2.2.jar GamemodeOverhaul {[email protected] LOAD_REGISTRIES}
ironchest-1.15.2-10.0.3.jar Iron Chests {[email protected] LOAD_REGISTRIES}
forge-1.15.2-31.1.25-client.jar Minecraft {[email protected] LOAD_REGISTRIES}
turtlemod-1.15.1-1.2.0-6.jar Turtle Mod {[email protected] LOAD_REGISTRIES}
EnchantmentDescriptions-1.15.2-2.0.4.jar EnchantmentDescriptions {[email protected] LOAD_REGISTRIES}
theoneprobe-1.15-2.0.1.jar The One Probe {[email protected] LOAD_REGISTRIES}
swingthroughgrass-1.15.2-1.4.0.jar SwingThroughGrass {[email protected] LOAD_REGISTRIES}
bspawncontrol_1.15.2-1.0.jar Better Spawner Control {[email protected] LOAD_REGISTRIES}
behgameon-1.15.2-1.3.0.jar Behgameon {[email protected] LOAD_REGISTRIES}
edibsgr_1.15.2-2.0.jar Edible Sugar {[email protected] LOAD_REGISTRIES}
ShoulderSurfing-1.15.2-1.22.jar Shoulder Surfing {[email protected] LOAD_REGISTRIES}
fallthroughsl_1.15.2-1.0.jar Fall Through Slime {[email protected] LOAD_REGISTRIES}
BerryBushes-1.1.1.jar Berry Bushes {[email protected] LOAD_REGISTRIES}
flux-4.11.1.jar Flux {[email protected] LOAD_REGISTRIES}
fl-3.1.3.jar Flux Library {[email protected] LOAD_REGISTRIES}
betconduitpl_1.15-1.0.jar Better Conduit Placement {[email protected] LOAD_REGISTRIES}
JAOPCA-1.15.2-3.0.0.21.jar JAOPCA {[email protected] LOAD_REGISTRIES}
FastWorkbench-1.15.1-3.0.0.jar FastWorkbench {[email protected] LOAD_REGISTRIES}
performant-1.15-1.7.jar Performant {[email protected] LOAD_REGISTRIES}
FastFurnace-1.15.1-3.0.0.jar FastFurnace {[email protected] LOAD_REGISTRIES}
AppleSkin-mc1.15.2-forge-1.0.13.jar AppleSkin {[email protected] LOAD_REGISTRIES}
lightningtweaks-1.15.2-0.0.1.0.jar Lightning Tweaks {lightningtweaks@NONE LOAD_REGISTRIES}
Aquaculture-1.15.2-2.0.11.jar Aquaculture 2 {[email protected] LOAD_REGISTRIES}
XL-Food-Mod-1.15.2-2.2.2.jar XL Food Mod {[email protected] LOAD_REGISTRIES}
parachutemod-1.15.2-3.0.2-479.jar Parachute Mod NG {[email protected] LOAD_REGISTRIES}
healingcf_1.15.2-1.7.jar Healing Campfire {[email protected] LOAD_REGISTRIES}
lootbagmod-1.15.1-1.5.jar Loot Bag Mod {[email protected] LOAD_REGISTRIES}
farlanders-1.15.2-1.1.2.jar The Farlanders {[email protected] LOAD_REGISTRIES}
Launched Version: 1.15.2-forge-31.1.25
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce GTX 1060 6GB/PCIe/SSE2 GL version 4.6.0 NVIDIA 432.00, 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)
CPU: 4x AMD Ryzen 3 2200G with Radeon Vega Graphics

This was determined to be a bug in the mod Flux, see #143