IV0RYYY

pls help asap i beg

Hi all, I have made a custom modpack in 1.20.1 for me and my partner to play, I myself loaded into the world perfectly fine and able to run around etc, but when they try to join me (they load in to the minecraft menu just fine) they get the error message java.nio.channels.closedchannelexception when trying to connect to my world, or just connection errors in general. I'm not sure what has gone wrong and I need help as I wanted to play my custom pack I made, I gave them the pack via the curseforge code. Any help ASAP appreciated.