I recently have been trying to host a ATM10 Minecraft server from my own PC. I downloaded the All The Mods 10 server files from Curseforge and it starts without a problem. The problem comes when I try to join from the Neoforge client, everytime I join I get the error message (java.lang.NullPointerException). When I go to my client logs I find the error message (Error: Failed to handle registry sync from server. java.lang.NullPointerException: null). I checked If all of my versions of Neoforge are the same, which they are, and I am using Java 21.I also have all the mods installed on my client, so that isnt the issue. What can I do?

Here are my logs:

Client: https://mclo.gs/dHsGMGy

Server: https://mclo.gs/AgHUr0L

Edit/Update: I found the error! I was joining from my normal minecraft launcher instead of the curseforge one. Once I switched I could join without any problem.

when people try to connect to my server, they receive this error message
internal exception java.lang.nullpointerexception can not invoke "net.minecraft.nbt.compoundtag.m_128459_(string)

i also received this error message as well but during this test for some reason it let me join the server, i've tested this out on singleplayer as well and the world works fine nothing seems to be corrupted it just doesn't work for the server.
we've also made multiple worlds for this specific pack i've made and they all have had this problem, randomly sometimes people will be able to join and play normally but other times they get this error and they cant play.
friends latest.log: https://mclo.gs/mHmks83
servers lastest.log: https://mclo.gs/si9AJk2

Tryna download neoforge for cobblemon but it keeps saying there was an exception running task: java.lang.NullPointerException 1.20.2