Minecraft v1.16.4
Forge v35.1.13
Some Assembly Required v1.1.0
Pokecube AIO v3.4.1
Fariy Lights v4.0.3

When I tried to place a cutting board, the server crashed with Pokecube AIO, while at the same time, the client crashed with Fairy Lights...
Client Crash Report
Server Crash Report

Thanks for the report, I've uploaded a patch that should fix the issue

Thanks!