[Player keeps disconnecting when joining my server (1.12.2)]

I am running a 1.12.2 modded server on forge version 14.23.5.2838 with these mods

https://pastebin.com/mgcMSE6q

Everything works perfectly fine, it's just that there's one player that cannot join because he keeps disconnecting when trying to get on. When I look in my console, this is what I see

https://pastebin.com/2UJN8tvE

I tried to restart my server, computer, had him do the same, try and disable firewall, and a few other things but so far nothing has worked. If anyone has any ideas on how to fix it, that would be amazing