TileEntity

Same issue without valkyrienskies?

Remove client-side only mods from your server Add a screenshot of your mods folder

Add crash-reports with sites like https://mclo.gs/ Delete the json file at \.minecraft\config\byg\trades.json5

Also add the latest.log from your logs-folder

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

Use Java 17

If other build do not work either, report it to the creator

Maybe an issue with spawnstructures_forge

Make a test without Vampirism

Downgrade Better_Dogs_X_Doggy_Talents_Next

Check for other builds of this mod

There are client-side-only mods in your server Like Radium ec_apotheosis_plugin is not working, too

Do not use the tlauncher - it is a cracked launcher - these are not supported

Remove the client-side-only mods like PresenceFootsteps

With picking mods, select the filter for the version and the Mod Loader With 1.21 most mods will be available for Forge and NeoForge So is you are using the Forge Mod Loader, do not add NeoForge mods

Make a test without the xaero mods

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

Delete the sophisticatedbackpacks-common.toml file in your config folder

Make a test with a pre-configured modpack on curseforge - use such a modpack as working base

Use Java 8

Remove mahoutsukai and waystones

Re-add these one by one until you find the one causing this issue

Maybe an issue with connectorextras

Also remove elevatorid and jei

Yes - delete the jei-server.toml file