Startup Issue with Minecraft - server fails to launch, failure with mods

[Binck_Burghout]

System Information

Field	Value
Operating System	Linux - Debian GNU/Linux 12 on x86_64
Product	AMP ‘Phobos’ v2.6.0.4 (Mainline)
Virtualization	Docker
Application	Minecraft
Module	MinecraftModule
Running in Container	Yes
Current State	Failed

Problem Description

Issue

Crash Report UUID: 912a7a34-e57f-4d41-baa0-b3199a29bb5c[00:14:09] [main/FATAL] [minecraft/Main]: Failed to start the minecraft server
net.minecraftforge.fml.LoadingFailedException: Loading errors encountered: [
Pixelmon TCG (tcg) has failed to load correctly
?7org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered,
Pixelmon Mod (pixelmon) has failed to load correctly
?7org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
]

-and-

Caused by: org.spongepowered.asm.mixin.throwables.ClassMetadataNotFoundException: net.minecraft.client.Minecraft

Reproduction Steps

• follow the mod installing guide
• add pixelmon mod to mods file (both the server and standard mod fail)
• launch the server
• check the server logs

[ThePotatoKing]

1. Go into the settings, select the version of Forge that you want, and press Donwload/Update
2. See if it starts
3. Try running the server without pixelmon and make sure forge starts correctly.
   i. If so, delete the world folder before adding pixelmon again
4. Make sure you’re using the right Java version for the version of Forge you’re running

Also, take a read through this FAQ here if you run into further issues:

Forge Frequently Asked Questions

Forge Frequently Asked Questions How do I run Forge using: start.sh/start.bat? No need! AMP handles all that for you. Just select the version of Forge you’ll need, hit update, and start your server. Where do I put custom start up arguments? You can find this options under: Configuration → Minecraft → Java and Memory → Additional java options I installed a modpack using AMP’s FTB downloader, why did it start in Vanilla? or The update manager reported a successful update, but ./Minecraft/minecr…

[Binck_Burghout]

it was ran with the settings we want, we already fixed the first error: The first error we ran into was a known error with java. downgrading to 11 fixed this. the next issue were 2 conflicting mods which caused the load of the pixelmon mods to fail. Cause 1: Essential, Cause 2: Cloth API and Chest Cavity Forge. Cloth API works for Forge Neoforge and Fabric, but caused errors with Chest Cavity Forge. changing from Chest Cavity Forge to Chest cavity fabric fixed this issue as well.

Edit: Chest cavity fabric doesn’t work when ran and can corrupt the world, Only fix is to remove chest cavity.