My friend has been trying to get into my server, but he crashes as soon as it loads. He has all the same versions of mods and forge as I do, and I can get on just fine.
pastebin.com/EVUXDeMy
He also crashes when opening a singleplayer game. He took out Astral Sorcery and he was able to open a singleplayer game without it crashing.

Something didn't install cleanly, looks like.

Recommend attempting to use twitch launcher with the mods instead of multimc and seeing if it makes a difference.

That worked, thank you!