Ugdhar

That looks like it!

The company that made the graphics device, as far as I can tell it appears to be using AMD Radeon graphics.

That log still says something is already bound to the port. If it's not showing anything running, perhaps there's a stale lock file or some other strange thing going on. If possible, perhaps a server reboot?

Can you post a new log? Just don't want the port in use error to be the cause of the server not starting:)

From the original log you posted: Check that another minecraft server isn't running on that machine using port 25565

I don't see a crash in that log, is it the complete log? If not, try reposting it

Please post logs as described in the faq, they contain more useful information.

Please post a log as described in the FAQ, it may have more information to help.

Have him update his video drivers, from the manufacturer website, not Microsoft update, and see if that helps.

See the FAQ, cracked launchers are not supported, buy the game.

Possibly, but to be honest I don't think I've ever seen a modpack that didn't have a ton of warnings and non-fatal errors, due to poor coding and incompatibilities between mods. So is it the server or client crashing?

Is it the server or client crashing? That server log doesn't show a crash that I can see, just the client logging in and disconnecting. If the client is crashing, post that log

Please see the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/) for how to properly post logs. Make sure you share the entire log, and not just part of it.

More information is needed to find the solution, logs, console output, and/or errors that are occurring.

Looks like you need to use a newer forge, 40.2.14, or use versions of the mods in the error that are compatible with 40.2.0

Please read the FAQ for how to post logs, pasting them inline is very hard to read. What happened after you removed JEI? A log from that run might help as well.

Please read the FAQ on how to post logs. Looks as though you have client only mods trying to load on a server. Remove them and give it another try

"in neruina-common.mixins.json:PlayerInventoryMixin from mod neruina failed injection check" If you remove nerunia does it still crash?

Try jarfix (provided you indeed have java installed)

You should post full logs as per the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/)

If you delete (make a backup just in case) the config file mentioned in the error, does it load?

Does it work if you use the regular Minecraft launcher? Also, please read the FAQ about how to post logs, pasting your log directly into your forums post makes it hard to read, and makes the post pages and pages long.

If you add 1 mod, does it crash? If you change which 1 mod you add, does it still crash? Which mods are you adding? What modpack are you starting from? A log from adding 1 mod and having it crash might possibly be helpful as well. It is entirely possible the mods you're adding are incompatible with other mods in the pack, or the way the pack is configured.

These forums are for Minecraft Forge, not Fabric. Your question would be better asked where Fabric support is given, likely their discord server.

These forums are for Minecraft Forge, not Fabric. Your question would be better asked where Fabric support is given, quite likely their discord channel.