My All The Mods Server crashes when I start it

It's as simple as the title. Whenever I start up my All The Mods server, it crashes instantly. I don't even get the notification that it started.

I didn't mention a map, nor am I using one. I just wanted to use it to build with my girlfriend. All The Mods is a Modpack, so unfortunately, this wasn't any help. Thank you for the response though!