My friend and I play with mods in 1.12.2. We got bored with the world and decided to create a new one. We added new mods, but still in 1.12.2. We were able to join perfectly fine on the old world and others before that. Now my friend cannot join the server, but I can. She is able to join other worlds with the same mods, but not this server. She also gets this message that says,
Fatally missing registry entries"
Then it makes her go back to the server list. She also has a mac and I have a windows laptop, so i'm not sure if this has anything to do with the issue. Hopefully someone can help, thanks!