there's crash report:
https://gist.github.com/JamesChang20022/8801566c64499982b4f62ac931fa9f9d#file-gistfile1-txt
and latest log:
https://gist.github.com/JamesChang20022/3c0a150d252dc00a6ab97e8a76a7be9a

sorry but i can't get any ideas about why caused the crash...except it may related to ancientspell craft loot table

Does this happen when you start the game and you load a world for the first time, or is it only occurring after saving and switching/reopening worlds in a single game session (=not closing the client)?

This modpack i have signed many time but it havent happened until yesterday.it happens when first starting the world，although now i knew it may caused by other mods.

According to a recent player report, this issue seems to be caused by "Zettai Grimoires". If still persists, please contact the author of that mod.