https://paste.dimdev.org/hezimumowo.mccrash

https://minecraft.curseforge.com/projects/various-oddities

Thanks for the report! I've looked into this issue and it appears you'll have to report this to Various Oddities, as the mimic chest has an erroneous implementation. You can see this crash without Fairy Lights from trying to open a mimic chest with just Charsets installed as well.

Dev has fixed this.