I got this crash when i tried to launch the game to test a modpack im making for 1.12.2.

This is the crash report below

**---- Minecraft Crash Report ----

WARNING: coremods are present:
SRPCotesiaCore (srpcotesia-1.12.2-1.2.1.jar)
MixinBooter (!mixinbooter-10.3.jar)
Contact their authors BEFORE contacting forge

// I'm sorry, Dave.

Time: 1/22/25 7:59 AM
Description: Initializing game

java.lang.NoClassDefFoundError: software/bernie/geckolib3/core/builder/ILoopType
at com.srpcotesia.init.SRPCItems.(SRPCItems.java:73)
at com.srpcotesia.block.BlockLithograph.(BlockLithograph.java:55)
at com.srpcotesia.init.SRPCBlocks.(SRPCBlocks.java:22)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_120_SRPCBlocks_registerBlocks_Register.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:845)
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:630)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
at net.minecraft.client.main.Main.main(SourceFile:123)
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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: software.bernie.geckolib3.core.builder.ILoopType
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 19 more
Caused by: java.lang.NullPointerException

No Mixin Metadata is found in the Stacktrace.

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

-- Head --
Thread: Client thread
Stacktrace:
at com.srpcotesia.init.SRPCItems.(SRPCItems.java:73)
at com.srpcotesia.block.BlockLithograph.(BlockLithograph.java:55)
at com.srpcotesia.init.SRPCBlocks.(SRPCBlocks.java:22)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_120_SRPCBlocks_registerBlocks_Register.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:845)
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:630)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
at net.minecraft.client.main.Main.main(SourceFile:123)
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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 503123536 bytes (479 MB) / 872415232 bytes (832 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.5.2860 17 mods loaded, 17 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State | ID                 | Version      | Source                               | Signature                                |
|:----- |:------------------ |:------------ |:------------------------------------ |:---------------------------------------- |
| LCH   | minecraft          | 1.12.2       | minecraft.jar                        | None                                     |
| LCH   | mcp                | 9.42         | minecraft.jar                        | None                                     |
| LCH   | FML                | 8.0.99.99    | forge-1.12.2-14.23.5.2860.jar        | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCH   | forge              | 14.23.5.2860 | forge-1.12.2-14.23.5.2860.jar        | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCH   | mixinbooter        | 10.3         | minecraft.jar                        | None                                     |
| LCH   | geckolib3          | 3.0.30       | geckolib-forge-1.12.2-3.0.30.jar     | None                                     |
| LCH   | nocubessrparmory   | 3.0.0        | NoCubes_SRP_Combat_Addon_3.0.0.jar   | None                                     |
| LCH   | nocubessrpsurvival | 3.0.0        | NoCubes_SRP_Survival_Addon_3.0.0.jar | None                                     |
| LCH   | nocubesrptweaks    | V4.1hf4      | nocubesrptweaks-V4.1hf4.jar          | None                                     |
| LCH   | eextra             | 0.5.2        | SRDimension(eextra)-0.5.2.jar        | None                                     |
| LCH   | srp_medical_addon  | 1.0.0        | SRP_medical_addon_1.12.2-1.0.3.jar   | None                                     |
| LCH   | srparasites        | 1.9.21       | SRParasites-1.12.2v1.9.21.jar        | None                                     |
| LCH   | srpcotesia         | 1.2.1        | srpcotesia-1.12.2-1.2.1.jar          | None                                     |
| LCH   | srpextra           | 0.31         | SRPExtra-0.31.jar                    | None                                     |
| LCH   | srpmeshi           | 1.4          | srpmeshi-1.4.jar                     | None                                     |
| LCH   | srpmeteor          | 1.5          | SRPMeteorite-1.5.jar                 | None                                     |
| LCH   | srptweaks          | V1           | srptweaks-V1.jar                     | None                                     |

Loaded coremods (and transformers): 

SRPCotesiaCore (srpcotesia-1.12.2-1.2.1.jar)

MixinBooter (!mixinbooter-10.3.jar)

GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.6.0 NVIDIA 472.12' Renderer: 'NVIDIA GeForce GTX 670/PCIe/SSE2'
Launched Version: 1.12.2-forge-14.23.5.2860
LWJGL: 2.9.4
OpenGL: NVIDIA GeForce GTX 670/PCIe/SSE2 GL version 4.6.0 NVIDIA 472.12, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.

Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: vanilla
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz**

Not a geckolib issue

Seek help in a modded minecraft player help server if needed like ModdedMC