TileEntity

The server is using Java 11 instead of Java 8

Yes

Remove all mods from your mods folder and test it again

Make a test without notreepunching

Does it work without any mods? Just Forge?

Add the crash-report or latest.log (logs-folder) with sites like https://mclo.gs/ and paste the link to it here

Same issue without the mod macos_input_fixes?

Make a test without the -nogui argument

Add crash-reports with sites like https://mclo.gs/ Make a test without L_Enders_Cataclysm or Immersive Portals

Make a test without supplementaries

Add the full crash-report or log

Cracked Launchers are not supported

Remove supplementaries or try older 1.20.1 builds

And without the mod werewolves?

Add the latets.log from your logs-folder Add the log with sites like https://mclo.gs/

It is an issue with medieval_craft The error refers to "Duplicate stat id" which is common for mcreator mods Looks like it refers to an Archer - so an invalid Entity near your location Backup the world and remove this mod

It is an issue with brewincompatdelight Add this mod: https://legacy.curseforge.com/minecraft/mc-mods/collectors-reap/files/5482850

Add crash-reports with sites like https://mclo.gs/ Update CyclopsCore to this build: https://www.curseforge.com/minecraft/mc-mods/cyclops-core/files/6199446

mclo.gs only shows 25000 lines - add the rest with another link

Also add the latest.log from your logs folder

Add the crash-report

Remove canary or servercore

Make a test with Forge only - without any mods Or use a pre-configured modpack as working base and add new mods one by one

Same issue without the mod jukeboxfix?

Add crash-reports with sites like https://mclo.gs/ Remove randompatches