Modpack Randomly Started Crashing

[BruhBronxy]

I have been working on a modpack I was planning to publish for a while. I was playing the modpack with no issues whatsoever then it just started crashing.

My Crash Log Is Below : 

 

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 2024-07-31 23:15:37
Description: Rendering overlay

java.lang.ExceptionInInitializerError: null
    at net.minecraft.client.resources.model.ModelBakery.handler$bgh000$immersiveMelodies$injectModelLoaderInit(ModelBakery.java:1523) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:ModelBakeryMixin,pl:mixin:APP:puzzleslib.forge.mixins.json:client.accessor.ModelBakeryAccessor,pl:mixin:APP:immersive_melodies.mixin.json:ModelLoaderMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.resources.model.ModelBakery.m_119306_(ModelBakery.java) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:ModelBakeryMixin,pl:mixin:APP:puzzleslib.forge.mixins.json:client.accessor.ModelBakeryAccessor,pl:mixin:APP:immersive_melodies.mixin.json:ModelLoaderMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.resources.model.ModelBakery.<init>(ModelBakery.java:155) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:ModelBakeryMixin,pl:mixin:APP:puzzleslib.forge.mixins.json:client.accessor.ModelBakeryAccessor,pl:mixin:APP:immersive_melodies.mixin.json:ModelLoaderMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.resources.model.ModelManager.m_246505_(ModelManager.java:83) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:puzzleslib.forge.mixins.json:client.ModelManagerForgeMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at java.util.concurrent.CompletableFuture.biApply(CompletableFuture.java:1311) ~[?:?] {re:mixin}
    at java.util.concurrent.CompletableFuture$BiApply.tryFire(CompletableFuture.java:1280) ~[?:?] {}
    at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483) ~[?:?] {}
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) ~[?:?] {}
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) ~[?:?] {}
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165) ~[?:?] {}
Caused by: java.lang.NullPointerException: Cannot invoke "immersive_melodies.cobalt.registration.Registration$Impl.register(net.minecraft.core.Registry, net.minecraft.resources.ResourceLocation, java.util.function.Supplier)" because "immersive_melodies.cobalt.registration.Registration.INSTANCE" is null
    at immersive_melodies.cobalt.registration.Registration.register(Registration.java:12) ~[immersive_melodies-0.3.0+1.20.1-forge.jar%23247!/:?] {re:classloading}
    at immersive_melodies.Sounds.register(Sounds.java:15) ~[immersive_melodies-0.3.0+1.20.1-forge.jar%23247!/:?] {re:classloading}
    at immersive_melodies.Sounds$Instrument.<init>(Sounds.java:27) ~[immersive_melodies-0.3.0+1.20.1-forge.jar%23247!/:?] {re:classloading}
    at immersive_melodies.Items.register(Items.java:68) ~[immersive_melodies-0.3.0+1.20.1-forge.jar%23247!/:?] {re:mixin,re:classloading}
    at immersive_melodies.Items.<clinit>(Items.java:25) ~[immersive_melodies-0.3.0+1.20.1-forge.jar%23247!/:?] {re:mixin,re:classloading}
    ... 12 more

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

-- Head --
Thread: Render thread
Suspected Mods: NONE
Stacktrace:
    at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:957) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:moonlight-common.mixins.json:GameRendererMixin,pl:mixin:APP:immersive_aircraft.mixins.json:client.GameRendererMixin,pl:mixin:APP:railways-common.mixins.json:client.MixinGameRenderer,pl:mixin:APP:railways-common.mixins.json:conductor_possession.MixinGameRenderer,pl:mixin:APP:do_a_barrel_roll.mixins.json:client.roll.GameRendererMixin,pl:mixin:APP:create.mixins.json:accessor.GameRendererAccessor,pl:mixin:APP:create.mixins.json:client.GameRendererMixin,pl:mixin:A,pl:runtimedistcleaner:A}
-- Overlay render details --
Details:
    Overlay name: net.minecraftforge.client.loading.ForgeLoadingOverlay
Stacktrace:
    at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:957) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:moonlight-common.mixins.json:GameRendererMixin,pl:mixin:APP:immersive_aircraft.mixins.json:client.GameRendererMixin,pl:mixin:APP:railways-common.mixins.json:client.MixinGameRenderer,pl:mixin:APP:railways-common.mixins.json:conductor_possession.MixinGameRenderer,pl:mixin:APP:do_a_barrel_roll.mixins.json:client.roll.GameRendererMixin,pl:mixin:APP:create.mixins.json:accessor.GameRendererAccessor,pl:mixin:APP:create.mixins.json:client.GameRendererMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1146) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20.1-20230612.114412-srg.jar%23272!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(Main.java:218) ~[forge-47.2.30.jar:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:flywheel.mixins.json:ClientMainMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
    at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.runTarget(CommonLaunchHandler.java:111) ~[fmlloader-1.20.1-47.2.30.jar:?] {}
    at net.minecraftforge.fml.loading.targets.CommonLaunchHandler.clientService(CommonLaunchHandler.java:99) ~[fmlloader-1.20.1-47.2.30.jar:?] {}
    at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$makeService$0(CommonClientLaunchHandler.java:25) ~[fmlloader-1.20.1-47.2.30.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:108) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:78) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.9.jar:?] {}
    at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}

-- Last reload --
Details:
    Reload number: 1
    Reload reason: initial
    Finished: No
    Packs: vanilla, Create Immersive Aircrafts Resource Pack 1.20.1 - 2.0.zip, Create Simple Storage 2.1.zip, Icon Xaero's 1.14 HF.zip, SRU_1-3.zip, YoannBBs_Melody_Tweaks.zip

-- System Details --
Details:
    Minecraft Version: 1.20.1
    Minecraft Version ID: 1.20.1
    Operating System: Windows 11 (amd64) version 10.0
    Java Version: 17.0.8, Microsoft
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
    Memory: 317704096 bytes (302 MiB) / 679477248 bytes (648 MiB) up to 4294967296 bytes (4096 MiB)
    CPUs: 16
    Processor Vendor: AuthenticAMD
    Processor Name: AMD Ryzen 7 3800X 8-Core Processor             
    Identifier: AuthenticAMD Family 23 Model 113 Stepping 0
    Microarchitecture: Zen 2
    Frequency (GHz): 3.90
    Number of physical packages: 1
    Number of physical CPUs: 8
    Number of logical CPUs: 16
    Graphics card #0 name: NVIDIA GeForce RTX 3060
    Graphics card #0 vendor: NVIDIA (0x10de)
    Graphics card #0 VRAM (MB): 4095.00
    Graphics card #0 deviceId: 0x2504
    Graphics card #0 versionInfo: DriverVersion=31.0.15.5186
    Memory slot #0 capacity (MB): 8192.00
    Memory slot #0 clockSpeed (GHz): 2.67
    Memory slot #0 type: DDR4
    Memory slot #1 capacity (MB): 8192.00
    Memory slot #1 clockSpeed (GHz): 2.67
    Memory slot #1 type: DDR4
    Virtual memory max (MB): 25014.26
    Virtual memory used (MB): 12411.45
    Swap memory total (MB): 8704.00
    Swap memory used (MB): 329.15
    JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx4096m -Xms256m
    Launched Version: forge-47.2.30
    Backend library: LWJGL version 3.3.1 build 7
    Backend API: NVIDIA GeForce RTX 3060/PCIe/SSE2 GL version 4.6.0 NVIDIA 551.86, NVIDIA Corporation
    Window size: 1920x1080
    GL Caps: Using framebuffer using OpenGL 3.2
    GL debug messages: 
    Using VBOs: Yes
    Is Modded: Definitely; Client brand changed to 'forge'
    Type: Client (map_client.txt)
    Graphics mode: fancy
    Resource Packs: vanilla, Create Immersive Aircrafts Resource Pack 1.20.1 - 2.0.zip, Create Simple Storage 2.1.zip (incompatible), Icon Xaero's 1.14 HF.zip (incompatible), SRU_1-3.zip, YoannBBs_Melody_Tweaks.zip
    Current Language: en_us
    CPU: 16x AMD Ryzen 7 3800X 8-Core Processor 
    ModLauncher: 10.0.9+10.0.9+main.dcd20f30
    ModLauncher launch target: forgeclient
    ModLauncher naming: srg
    ModLauncher services: 
        mixin-0.8.5.jar mixin PLUGINSERVICE 
        eventbus-6.0.5.jar eventbus PLUGINSERVICE 
        fmlloader-1.20.1-47.2.30.jar slf4jfixer PLUGINSERVICE 
        fmlloader-1.20.1-47.2.30.jar object_holder_definalize PLUGINSERVICE 
        fmlloader-1.20.1-47.2.30.jar runtime_enum_extender PLUGINSERVICE 
        fmlloader-1.20.1-47.2.30.jar capability_token_subclass PLUGINSERVICE 
        accesstransformers-8.0.4.jar accesstransformer PLUGINSERVICE 
        fmlloader-1.20.1-47.2.30.jar runtimedistcleaner PLUGINSERVICE 
        modlauncher-10.0.9.jar mixin TRANSFORMATIONSERVICE 
        modlauncher-10.0.9.jar fml TRANSFORMATIONSERVICE 
    FML Language Providers: 
        [email protected]
        [email protected]
        javafml@null
        lowcodefml@null
    Mod List: 
        client-1.20.1-20230612.114412-srg.jar             |Minecraft                     |minecraft                     |1.20.1              |NONE      |Manifest: a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
        forge-1.20.1-47.2.30-universal.jar                |Forge                         |forge                         |47.2.30             |NONE      |Manifest: 84:c

[BruhBronxy]

I just figured out that a mod was missing a specific lib not sure why it blamed immersive melodies.