Minecraft version: 1.17.1
Modloader: Fabric
Fabric loader version: 0.11.7
Environment: Singleplayer

Mod name: Collective (Fabric)
Mod version: 1.62

---- Minecraft Crash Report ----
// Why did you do that?

Time: 11/15/21, 6:40 PM
Description: Exception ticking world

java.lang.AbstractMethodError: Receiver class com.natamus.conduitspreventdrowned.Main$$Lambda$4874/0x0000000800d8d090 does not define or inherit an implementation of the resolved method 'abstract boolean onMobCheckSpawn(net.minecraft.class_1308, net.minecraft.class_3218, net.minecraft.class_2338, net.minecraft.class_3730)' of interface com.natamus.collective_fabric.fabric.callbacks.CollectiveSpawnEvents$Mob_Check_Spawn.
at com.natamus.collective_fabric.fabric.callbacks.CollectiveSpawnEvents.lambda$static$0(CollectiveSpawnEvents.java:15)
at net.minecraft.world.SpawnHelper.localvar$dfk000$NaturalSpawner_spawnCategoryForPosition(SpawnHelper:1622)
at net.minecraft.world.SpawnHelper.spawnEntitiesInChunk(SpawnHelper:271)
at net.minecraft.world.SpawnHelper.spawnEntitiesInChunk(SpawnHelper:199)
at net.minecraft.world.SpawnHelper.spawn(SpawnHelper:187)
at net.minecraft.server.world.ServerChunkManager.method_20801(ServerChunkManager:368)
at java.util.ArrayList.forEach(ArrayList.java:1511)
at net.minecraft.server.world.ServerChunkManager.tickChunks(ServerChunkManager:355)
at net.minecraft.server.world.ServerChunkManager.tick(ServerChunkManager:324)
at net.minecraft.server.world.ServerWorld.tick(ServerWorld:372)
at net.minecraft.server.MinecraftServer.tickWorlds(MinecraftServer:891)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer:831)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer:96)
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer:697)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer:270)
at java.lang.Thread.run(Thread.java:831)

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

-- Head --
Thread: Server thread
Stacktrace:
at com.natamus.collective_fabric.fabric.callbacks.CollectiveSpawnEvents.lambda$static$0(CollectiveSpawnEvents.java:15)
at net.minecraft.class_1948.localvar$dfk000$NaturalSpawner_spawnCategoryForPosition(class_1948.java:1622)
at net.minecraft.class_1948.method_24930(class_1948.java:271)
at net.minecraft.class_1948.method_8663(class_1948.java:199)
at net.minecraft.class_1948.method_27821(class_1948.java:187)
at net.minecraft.class_3215.method_20801(class_3215.java:368)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at net.minecraft.class_3215.method_14161(class_3215.java:355)
at net.minecraft.class_3215.method_12127(class_3215.java:324)
at net.minecraft.class_3218.method_18765(class_3218.java:372)

-- Affected level --
Details:
All players: 1 total; [class_3222['Werlitra4446'/629, l='ServerLevel[Survival Main]', x=-15.94, y=68.25, z=184.70]]
Chunk stats: 2025
Level dimension: minecraft:overworld
Level spawn location: World: (0,64,112), Section: (at 0,0,0 in 0,4,7; chunk contains blocks 0,0,112 to 15,255,127), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 22481 game time, 33785 day time
Level name: Survival Main
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Level weather: Rain time: 49876 (now: false), thunder time: 67054 (now: false)
Known server brands: fabric
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:891)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:831)
at net.minecraft.class_1132.method_3748(class_1132.java:96)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:697)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:270)
at java.base/java.lang.Thread.run(Thread.java:831)

-- System Details --
Details:
Minecraft Version: 1.17.1
Minecraft Version ID: 1.17.1
Operating System: Windows 10 (amd64) version 10.0
Java Version: 16.0.1, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 2254688192 bytes (2150 MiB) / 4194304000 bytes (4000 MiB) up to 4194304000 bytes (4000 MiB)
CPUs: 8
Processor Vendor: AuthenticAMD
Processor Name: AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
Identifier: AuthenticAMD Family 23 Model 24 Stepping 1
Microarchitecture: Zen / Zen+
Frequency (GHz): 2.10
Number of physical packages: 1
Number of physical CPUs: 4
Number of logical CPUs: 8
Graphics card #0 name: AMD Radeon(TM) Vega 8 Graphics
Graphics card #0 vendor: Advanced Micro Devices, Inc. (0x1002)
Graphics card #0 VRAM (MB): 2048.00
Graphics card #0 deviceId: 0x15d8
Graphics card #0 versionInfo: DriverVersion=27.20.11044.5003
Memory slot #0 capacity (MB): 4096.00
Memory slot #0 clockSpeed (GHz): 2.67
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 4096.00
Memory slot #1 clockSpeed (GHz): 2.40
Memory slot #1 type: DDR4
Virtual memory max (MB): 15284.55
Virtual memory used (MB): 13417.95
Swap memory total (MB): 9192.94
Swap memory used (MB): 0.00
JVM Flags: 10 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmn128M -Xmx4000M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Fabric Mods:
advanced_runtime_resource_pack: Runtime Resource Pack 0.4.3
advancementplaques: Advancement Plaques 1.4.2
alloy_forgery: Alloy Forgery 2.0.5
amecsapi: Amecs API 1.1.5+mc21w16a
animatica: Animatica 0.1+1.17
antighost: AntiGhost 1.17.1-fabric0.36.1-1.1.4
appleskin: AppleSkin mc1.17-2.1.3
aqupdgrizzly: Grizzly Bear mob 1.17-1.2.0
architectury: Architectury 2.6.35
autoconfig1u: Auto Config v1 Updated 3.2.2
backslot: BackSlot 1.2.2
backslotaddon: BackSlot Addon 1.0.7
balm-fabric: Balm 1.3.0+0
basicshields: Basic Shields [Fabric] 1.1.0-1.17.1
betterbeds: Better Beds 1.2.0
betterdungeons: YUNG's Better Dungeons 1.17-1.0.2
betterthirdperson: Better Third Person 1.5.0
bfapi: BFAPI 1.1.11
blur: Blur (Fabric) 2.4.0
bottledair-fabric: Bottled Air (Fabric) 1.0
caelus: Caelus API 0.0.16-1.17
candlestick: Candlestick 1.1.1
capes: Capes 1.2.2+1.17
cardinal-components-base: Cardinal Components API (base) 3.1.1
cardinal-components-entity: Cardinal Components API (entities) 3.1.1
cardinal-components-item: Cardinal Components API (items) 3.0.0-nightly.1.17-pre2
carrier: Carrier 1.8.1
cavebiomes: Cave Biomes 0.6.3
cem: Custom Entity Models 0.6.2
citresewn: CITResewn 0.8.1
cleancut: CleanCut 1.17-4.0-fabric
clear-skies: Clear Skies 1.5.70
cloth-api: Cloth API 2.0.54
cloth-basic-math: cloth-basic-math 0.6.0
cloth-client-events-v0: Cloth Client Events v0 2.0.54
cloth-common-events-v1: Cloth Common Events v1 2.0.54
cloth-config2: Cloth Config v5 5.1.40
cloth-datagen-api-v1: Cloth Datagen v1 2.0.54
cloth-scissors-api-v1: Cloth Scissors API v1 2.0.54
cloth-utils-v1: Cloth Utils v1 2.0.54
coat: Coat 1.0.0-beta.12
collective-fabric: Collective (Fabric) 1.62
colormatic: Colormatic 2.3.0+mc.1.17.1
com_electronwill_night-config_core: core 3.6.3
com_electronwill_night-config_toml: toml 3.6.3
com_moandjiezana_toml_toml4j: toml4j 0.7.2
com_velocitypowered_velocity-native: velocity-native 1.1.0-SNAPSHOT
companion_bats: Companion Bats 1.18.4
conduitspreventdrowned-fabric: Conduits Prevent Drowned (Fabric) 1.4
connectiblechains: Connectible Chains 1.2.3
continuity: Continuity 1.0.2+1.17
copperequipment: Copper Equipment 1.7
cosmetica: Cosmetica 0.2.1
couplings: Couplings 1.5.0+1.17
cozy_camping: Cozy Camping 1.0.0-1.17
crawl: Crawl 0.9.3
crowdin-translate: CrowdinTranslate 1.3+1.17
cullleaves: Cull Leaves 2.3.2
cursormod: Custom Cursor Mod 1.3.0
custom-fog: Custom Fog 2.0.0
customportalapi: Custom Portal Api 0.0.1-beta45-1.17
cyanide: Cyanide (Fabric) 1.2.1
darkpaintings: Dark Paintings 4.0.2
dawn: Dawn API 2.0.6
deathknell: Example Mod 1.0.1
deathlog: DeathLog 0.2.1
ditn: Deep In The Night 0.1.2
doublejump: Double Jump Mod 1.0.1+mc1.17
dsurround: §6Dynamic Surroundings§r: §eFabric Edition 0.0.4
dynamicfps: Dynamic FPS 2.0.6
eatinganimationid: Eating Animation 1.2
elytratrinket: Elytra Trinket 2.0.1-1.17
emeraldextendedfabric: EmeraldExtendedFabric 1.0
enchant_giver: Enchant Giver 1.1.0
enchantmentdescriptions: Enchantment Descriptions 4.0.1
enderscape: Enderscape 0.1.1
endgoblintraders: End Goblin Traders 1.2.1
entityculling: EntityCulling-Fabric 1.3.3
extractpoison-fabric: Extract Poison (Fabric) 1.5
fab: Foodables 1.1.0
fabric: Fabric API 0.41.3+1.17
fabric-api-base: Fabric API Base 0.3.0+a02b446313
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.3.0+cbda931818
fabric-biome-api-v1: Fabric Biome API (v1) 3.2.1+ffbe6d8f18
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.5+a02b446318
fabric-command-api-v1: Fabric Command API (v1) 1.1.3+5ab9934c18
fabric-commands-v0: Fabric Commands (v0) 0.2.2+92519afa18
fabric-containers-v0: Fabric Containers (v0) 0.1.12+cbda931818
fabric-content-registries-v0: Fabric Content Registries (v0) 0.3.0+cbda931818
fabric-copper-golem: Copper Golem 1.0.1+1.17.1
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.5+be9da31018
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.0.12+ffbe6d8f18
fabric-entity-events-v1: Fabric Entity Events (v1) 1.3.0+57bef5a318
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.10+fc40aa9d18
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.1+92519afa18
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.7+cbda931818
fabric-item-api-v1: Fabric Item API (v1) 1.2.4+a02b4463d5
fabric-item-groups-v0: Fabric Item Groups (v0) 0.3.0+ef17126d18
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.4+cbda931818
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.2+36b77c3e18
fabric-language-kotlin: Fabric Language Kotlin 1.6.5+kotlin.1.5.31
fabric-language-scala: Fabric Language Scala 1.1.0+scala.2.13.6
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 1.4.4+a02b44633d
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.0.4+a02b446318
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.3+92519afa18
fabric-models-v0: Fabric Models (v0) 0.3.0+a02b446318
fabric-networking-api-v1: Fabric Networking API (v1) 1.0.13+cbda931818
fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.11+a02b446318
fabric-networking-v0: Fabric Networking (v0) 0.3.2+92519afad5
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 1.10.9+b7ab6121d5
fabric-object-builders-v0: Fabric Object Builders (v0) 0.7.3+a02b446318
fabric-particles-v1: Fabric Particles (v1) 0.2.4+a02b446318
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.7.12+81e15a8918
fabric-renderer-api-v1: Fabric Renderer API (v1) 0.4.4+cbda931818
fabric-renderer-indigo: Fabric Renderer - Indigo 0.4.8+cbda931818
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 3.2.4+7931163218
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.5+a02b446313
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.14+4658223018
fabric-rendering-v0: Fabric Rendering (v0) 1.1.5+7931163218
fabric-rendering-v1: Fabric Rendering (v1) 1.9.0+7931163218
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.4.8+a00e834b18
fabric-screen-api-v1: Fabric Screen API (v1) 1.0.4+198a96213d
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.1.8+cbda931818
fabric-structure-api-v1: Fabric Structure API (v1) 1.1.13+5ab9934c18
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 1.2.1+81e15a8918
fabric-textures-v0: Fabric Textures (v0) 1.0.6+a02b446318
fabric-tool-attribute-api-v1: Fabric Tool Attribute API (v1) 1.2.12+b7ab6121d5
fabric-transfer-api-v1: Fabric Transfer API (v1) 1.4.1+ffbe6d8f18
fabricloader: Fabric Loader 0.11.7
fabricshieldlib: Fabric Shield Lib 1.4.5+1.17
fabricsit: FabricSit 1.6.4
fabrishot: Fabrishot 1.5.1
fallingleaves: Falling Leaves 1.7.4+1.17.1
fallingtree: FallingTree 2.14.3
farmersdelight: Farmer's Delight 1.17.1-0.1.2
ferritecore: FerriteCore 3.0.3
fiber: fiber 0.23.0-2
fluidtank: Fluid Tank 17.1.3-fabric
fractalportals: FractalPortals 1.2.0
geckolib3: Geckolib 3.0.16
gildedarmor: Gilded Armor 1.3.1+fabric-1.17.1
gobber2: Gobber2 2.4.58
goblintraders: Goblin Traders 1.2.0
harvest_scythes: Harvest Scythes 2.0.6
healingcampfire-fabric: Healing Campfire (Fabric) 3.3
hellish-materials: Hellish Materials 0.13.1
hydrogen: Hydrogen 0.3
iceberg: Iceberg 1.0.23
illuminations: Illuminations 1.10
imperishableitems: Imperishable Items 1.1.2-mc1.17
indium: Indium 1.0.0+mc1.17.1
inmis: Inmis 2.3.2-1.17.1
inspecio: Inspecio 1.1.0+1.17
inventorytotem-fabric: Inventory Totem (Fabric) 1.5
iris: Iris 1.1.2+build.9
itemmodelfix: Item Model Fix 1.0.2+1.17
java: OpenJDK 64-Bit Server VM 16
jumpoverfences: JumpOverFences 1.16-0.0.3
kirin: Kirin UI 1.9.1
krypton: Krypton 0.1.4
lambdabettergrass: LambdaBetterGrass 1.2.1+1.17
lambdynlights: LambDynamicLights 2.0.2+1.17
lazydfu: LazyDFU 0.1.2
libblockattributes: LibBlockAttributes 0.9.2
libblockattributes_core: LibBlockAttributes (Core) 0.9.2
libblockattributes_fluids: LibBlockAttributes (Fluids) 0.9.2
libblockattributes_items: LibBlockAttributes (Items) 0.9.2
libcd: LibCapableData 3.0.3+1.16.3
libzoomer: LibZoomer 0.2.1+1.17
lithium: Lithium 0.7.4
lovely_snails: Lovely Snails 1.0.3+1.17
mavm: More Axolotl Variants Mod 1.0.5
maybe-data: Maybe data 1.0.1-1.17
midnightlib: MidnightLib 0.3.0
minecraft: Minecraft 1.17.1
mining_dims: Mining Dimensions 1.1.13
mm: Manningham Mills 2.3
mo_glass: Mo Glass 1.5-MC1.17.1
modify-drops-api: Modify Drops API 0.3.2
modmenu: Mod Menu 2.0.14
morebannerfeatures: More Banner Features 1.0.9
morevillagers-fabric: MoreVillagersFabric 2.1.1-SNAPSHOT
morevillagesmod: More Villages Mod 1.0.0
mostructures: Mo' Structures 1.2.1-1.17
mythicmetals: Mythic Metals 0.10.0
nauticality: Nauticality 0.1.2
notenoughanimations: NotEnoughAnimations 1.3.3
notenoughcrashes: Not Enough Crashes 3.7.2+1.17.1
npcvariety: NPC Variety 2.2.0
observed: Observed 1.2.1
okzoomer: Ok Zoomer 5.0.0-beta.2+1.17
omega-config: OmegaConfig 1.0.8
org_aperlambda_lambdajcommon: lambdajcommon 1.8.1
org_codehaus_groovy_groovy: groovy 3.0.8
org_codehaus_groovy_groovy-jsr223: groovy-jsr223 3.0.8
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 1.5.31
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 1.5.31
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 1.5.31
org_jetbrains_kotlin_kotlin-stdlib-jdk8: kotlin-stdlib-jdk8 1.5.31
org_jetbrains_kotlinx_kotlinx-coroutines-core-jvm: kotlinx-coroutines-core-jvm 1.5.2
org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.5.2
org_jetbrains_kotlinx_kotlinx-serialization-core-jvm: kotlinx-serialization-core-jvm 1.3.0
org_jetbrains_kotlinx_kotlinx-serialization-json-jvm: kotlinx-serialization-json-jvm 1.3.0
org_openjdk_nashorn_nashorn-core: nashorn-core 15.3
owo: oωo 0.3.0
oxidized: Oxidized 1.4.0
packet_tweaker: Packet Tweaker 0.2.0+1.17.1
paperdoll: PaperDoll 1.0.0-mc1.17.1
particlerain: Particle Rain 1.5.0
perorate: Perorate 1.2.0
pling: Pling 1.4.0
presencefootsteps: Presence Footsteps r32-1.17-rc1
promenade: Promenade 2.1.2
pugh_lib: Pugh Lib ${version}
pugh_tools: Pugh Tools ${version}
quickspyglasser: Quick Spyglasser 0.3.0
rare-ice: Rare Ice 0.3.0
reach-entity-attributes: Reach Entity Attributes 2.1.1
reeses-sodium-options: Reese's Sodium Options 1.2.0
rocks: This Rocks! 1.5.1
roughlyenoughitems: Roughly Enough Items 6.1.329
satin: Satin 1.6.4
scorch: Scorch 1.1.2
shwfox: Shadew's Foxes 1.1+fabric
silkspawners: SilkSpawners 1.0.2
simplyimprovedterrain: Simply Improved Terrain 0.4.0.3-Fabric-1.17
skinlayers: 3d Skin Layers 1.2.1
slight-gui-modifications: 'Slight' GUI Modifications 2.0.2
smoothboot: Smooth Boot 1.16.5-1.6.0
smoothscrollingeverywhere: Smooth Scrolling Everywhere 3.0.3-unstable
snowballsfreezemobs-fabric: Snowballs Freeze Mobs (Fabric) 1.5
snowundertrees: Snow Under Trees 1.0.0
sodium: Sodium 0.3.2+IRIS2-build.9
sodium-extra: Sodium Extra 0.3.5
spruceui: SpruceUI 3.3.0+1.17
squirrels: Squirrels 1.2.0-1.17
static-content: Static Content 1.0.1-1.16.2
staticdata: Static Data 1.1.2
strawdummy: Straw Dummy 1.5.0
terraform-shapes-api-v1: Terraform Shapes API (v1) 1.0.4
terrarianslimes: Terrarian Slimes 1.1-BETA+1.17
thonkutil: ThonkUtil 1.2
toolstats: Tool Stats 2.0.1
torohealth: ToroHealth Damage Indicators 1.17.1-fabric-12
transliterationlib: TRansliterationLib 1.2.2
trident_return: TridentReturn 1.2.4
trinketofundying: Trinket of Undying 2.0.0-1.17
trinkets: Trinkets 3.0.4
trinketshulkerboxes: Trinket Shulker Boxes 2.0.0-1.17
tweed4_annotated: tweed4_annotated 1.2.0
tweed4_base: tweed4_base 1.3.1
tweed4_data: tweed4_data 1.2.0
tweed4_data_hjson: tweed4_data_hjson 1.1.0
tweed4_tailor_coat: tweed4_tailor_coat 1.0.1
tweed4_tailor_screen: tweed4_tailor_screen 1.0.1
vanillaplusbiomes: Vanilla Plus Biomes 0.3.2
villagernames: Villager Names 2.0.0
visuality: Visuality 0.3.0
visualoverhaul: VisualOverhaul 3.3.0
wandering_collector: Wandering Collector 1.0.3+mc1.17
waveycapes: WaveyCapes 1.0.4
waystones: Waystones 8.1.1+0
weaponthrow: Weapon Throw 1.17.1-1.4
wfw: Warhammer Fantasy Weapons 0.1.3-1.17.1
woods_and_mires: Woods and Mires 1.1.1+1.17
yungsapi: YUNG's API 1.17-Fabric-19
Player Count: 1 / 8; [class_3222['Werlitra4446'/629, l='ServerLevel[Survival Main]', x=-15.94, y=68.25, z=184.70]]
Data Packs: vanilla, fabric-copper-golem/copper_golem, Fabric Mods
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fabric'
Suspected Mods: Collective (Fabric) (collective-fabric)

Thanks for opening the bug report! This has been fixed in version 1.5 of the mod. Sorry for the inconvenience.

https://www.curseforge.com/minecraft/mc-mods/conduits-prevent-drowned-fabric/files/all