TileEntity

Update your AMD/ATI drivers - get the drivers from their website - do not update via system

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

Also remove randompatches

It is an issue with SolarFluxReborn - maybe a conflict with AE2 Report it to the creator

Add the new crash-report

Add this mod: https://www.curseforge.com/minecraft/mc-mods/advancements-debug

Contact the support of this site

Common mods are Industrial foregoing, botania, create or immersive engineering - but these are not up-to-date for 1.21.1

Make a test without Rubidium

Remove randompatches

Replace Journeymap with this build: https://www.curseforge.com/minecraft/mc-mods/journeymap/files/5616347

Make a test without modernfix

Worldedit Forge is currently only available for 1.20.4 and older

Add the new log

Add crash-reports with sites like https://mclo.gs/ Make a test without tinyallies

Delete the fml.toml file in your config folder

Start the server via run.bat file Before, open the user_jvm_args file and remove the # at # -Xmx4G

Same issue without the mod Essential?

Optifine is currently not compatible with forge

There should be always the latest.log in the logs-folder

I have no idea - maybe it is some kind of system related issue

There is an issue with createdeco - make a test without it

Remove @user_jvm_args.txt from the script and replace it with -Xmx4G

I have no idea - maybe an issue with Java Same issue with another Launcher?

Use Java 8 - remove newer versions