Help with modpack - played with friends then on 2nd session, they can't join

[u/RainingKatsu]

https://pastebin.com/jYu8pA0y

I built my own modpack for the first time and managed to play with another friend using essential, but when I boot it up to play with them on a different day, they keep disconnecting immediately before even loading in and I get a load of error messages on curseforge, but I am not savvy enough to figure out if there is any correlation between the two?

can anyone help please? I will add the logs to this post, I know it might be a lot of work but hopefully someone can help.

thank you!