https://mclo.gs/J7OYpaU
This report is generated whenever I attempt to boot my server, and is caused by the cobblegenerators mod. However, booting a singleplayer world works fine. Any idea what is going on here?
net/minecraft/class_465 translates to net/minecraft/client/gui/screen/ingame/HandledScreen -- which is client side only. The mod wasn't designed to run on the server, and has no source code. Probably best to pick another mod.