Mods:
BOMD-1.3-1.17.1.jar
Cardinal-Components-API-3.1.1.jar
cloth-config-5.0.38-fabric.jar
fabric-api-0.40.1+1.17.jar
fabric-language-kotlin-1.6.4+kotlin.1.5.30.jar
geckolib-1.17.1-3.0.2.jar
modmenu-2.0.13.jar

Time: 29.09.21, 12:45
Description: Initializing game

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'bosses_of_mass_destruction'!
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:50)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:33)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointClient.start(EntrypointClient.java:33)
at net.minecraft.class_310.(class_310.java:457)
at net.minecraft.client.main.Main.main(Main.java:179)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:234)
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:153)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:28)
Caused by: java.lang.NoClassDefFoundError: software/bernie/geckolib3/GeckoLib
at net.barribob.boss.MainKt.init(Main.kt:45)
at java.base/java.lang.invoke.MethodHandleProxies$1.invoke(MethodHandleProxies.java:194)
at jdk.proxy2/com.sun.proxy.jdk.proxy2.$Proxy29.onInitialize(Unknown Source)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:47)
... 11 more
Caused by: java.lang.ClassNotFoundException: software.bernie.geckolib3.GeckoLib
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:636)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:175)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
... 15 more

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

-- Head --
Thread: Render thread
Stacktrace:
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke0(EntrypointUtils.java:50)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointUtils.invoke(EntrypointUtils.java:33)
at net.fabricmc.loader.entrypoint.minecraft.hooks.EntrypointClient.start(EntrypointClient.java:33)
at net.minecraft.class_310.(class_310.java:457)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.main.Main.main(Main.java:179)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:234)
at net.fabricmc.loader.launch.knot.Knot.launch(Knot.java:153)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:28)

-- 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: 625604920 bytes (596 MiB) / 1375731712 bytes (1312 MiB) up to 2147483648 bytes (2048 MiB)
CPUs: 16
Processor Vendor: AuthenticAMD
Processor Name: AMD Ryzen 7 1700X Eight-Core Processor
Identifier: AuthenticAMD Family 23 Model 1 Stepping 1
Microarchitecture: Zen
Frequency (GHz): 3,40
Number of physical packages: 1
Number of physical CPUs: 8
Number of logical CPUs: 16
Graphics card #0 name: NVIDIA GeForce GTX 1080
Graphics card #0 vendor: NVIDIA (0x10de)
Graphics card #0 VRAM (MB): 4095,00
Graphics card #0 deviceId: 0x1b80
Graphics card #0 versionInfo: DriverVersion=30.0.14.7141
Memory slot #0 capacity (MB): 8192,00
Memory slot #0 clockSpeed (GHz): 2,13
Memory slot #0 type: DDR4
Memory slot #1 capacity (MB): 8192,00
Memory slot #1 clockSpeed (GHz): 2,13
Memory slot #1 type: DDR4
Virtual memory max (MB): 32714,84
Virtual memory used (MB): 15222,68
Swap memory total (MB): 16384,00
Swap memory used (MB): 304,05
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Fabric Mods:
bosses_of_mass_destruction: Bosses of Mass Destruction (Beta) 1.3-1.17.1
cardinal-components: Cardinal Components API 3.1.1
cardinal-components-base: Cardinal Components API (base) 3.1.1
cardinal-components-block: Cardinal Components API (blocks) 3.1.1
cardinal-components-chunk: Cardinal Components API (chunks) 3.1.1
cardinal-components-entity: Cardinal Components API (entities) 3.1.1
cardinal-components-item: Cardinal Components API (items) 3.1.1
cardinal-components-level: Cardinal Components API (world saves) 3.1.1
cardinal-components-scoreboard: Cardinal Components API (scoreboard) 3.1.1
cardinal-components-util: Cardinal Components API (utilities) 3.1.1
cardinal-components-world: Cardinal Components API (worlds) 3.1.1
cloth-basic-math: Cloth Basic Math 0.5.1
cloth-config2: Cloth Config v5 5.0.38
fabric: Fabric API 0.40.1+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) 3.2.0+cbda931818
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-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.5+be9da31018
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.0.11+6cefd57718
fabric-entity-events-v1: Fabric Entity Events (v1) 1.2.3+87cc6e4c18
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+cbda931818
fabric-item-groups-v0: Fabric Item Groups (v0) 0.2.10+b7ab612118
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 1.6.4+kotlin.1.5.30
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 1.4.4+a02b446318
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+92519afa13
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 1.10.9+cbda931818
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) 0.7.10+e2961fee18
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) 3.2.3+4658223018
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.5+a02b446318
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.14+4658223018
fabric-rendering-v0: Fabric Rendering (v0) 1.1.4+4658223018
fabric-rendering-v1: Fabric Rendering (v1) 1.8.2+ffb6d41e18
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+b06cb95b18
fabric-textures-v0: Fabric Textures (v0) 1.0.6+a02b446318
fabric-tool-attribute-api-v1: Fabric Tool Attribute API (v1) 1.2.12+b7ab612118
fabric-transfer-api-v1: Fabric Transfer API (v1) 1.3.1+4658223018
fabricloader: Fabric Loader 0.11.7
java: OpenJDK 64-Bit Server VM 16
maelstrom_library: Maelstrom Library 1.2.2-1.17.1
minecraft: Minecraft 1.17.1
modmenu: Mod Menu 2.0.13
multipart_entities: MultipartEntities 1.1.3-1.17.1
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 1.5.30
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 1.5.30
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 1.5.30
org_jetbrains_kotlin_kotlin-stdlib-jdk8: kotlin-stdlib-jdk8 1.5.30
org_jetbrains_kotlinx_kotlinx-coroutines-core-jvm: kotlinx-coroutines-core-jvm 1.5.1
org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.5.1
org_jetbrains_kotlinx_kotlinx-serialization-core-jvm: kotlinx-serialization-core-jvm 1.2.2
org_jetbrains_kotlinx_kotlinx-serialization-json-jvm: kotlinx-serialization-json-jvm 1.2.2
Launched Version: fabric-loader-0.11.7-1.17.1
Backend library: LWJGL version 3.2.2 build 10
Backend API: NO CONTEXT
Window size:
GL Caps: Using framebuffer using OpenGL 3.2
GL debug messages:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
CPU:

I believe you have the forge version of geckolib - grab the fabric version instead