TileEntity

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

Make a test without Optifine - looks like Optifine is running into a rendering conflict with alexmobs There is a CombJelly in your area/house which is causing this issue

Delete the config of nochatreports (config folder) If there is no change, remove this mod

Looks like an issue with blueprint

Did you recently add sophisticatedbackpacks and sophisticatedcore? If yes, try other builds Also remove bygonenether

java.lang.RuntimeException: Invalid id 4096 - maximum id range exceeded. Did you fix it with adding NotEnoughIDs? https://www.curseforge.com/minecraft/mc-mods/notenoughids And add the new crash-report with sites like https://paste.ee/

Make a test with adding CofHCore https://www.curseforge.com/minecraft/mc-mods/cofh-core/files/2388750

Does it work without Optifine?

Is there a change without towns_and_towers? Backup your world before

Do you use the Dab Mod? If yes, remove it - there is no 1.12.2 build

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

https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html Use the Windows x64 Installer

Yes

Add the latest.log (logs-folder) with sites like https://paste.ee/ and paste the link to it here

Use Java 17 instead of Java 21

Is there a logs-folder with a latest.log? If yes, add it here with sites like https://paste.ee/ Also make a test without the nogui entry

Make a test without modernfix

Add the lines of your start bat file

Somewhere in the Server settings / Aternos board or similar

1.20.6 requires Java 21 to work

Does the Server also have 8 GB?

Also make a test without the mod parcool

What modpack do you use and how much RAM do you have there? Maybe the modpack is too large for the given RAM

Remove the new mods one by one until you find the one, causing this issue

Is this the full crash-report?