Edit: from their post it appears VMM related.
Summary
Which specific error? “Out of mem” error can encompass many different errors. The most common is Lua script not having enough heap, default 1 GB, you can get this even without mods (though worse with) due to the crafting updates. You can have all the RAM in the world and you’d till get this error otherwise with the 1gb default limit.
IDK if it was fixed but you can prevent this error by setting a 2gb max Lua heap size.
I still don’t know why this isn’t a launcher option, it could save a lot of people a lot of aggravation.
Add the 1 to 2gb Lua heap switch to launcher settings Plz