TheSliverOfInfinity

So I'm trying to set up a skyfactory server but the only thing that runs is the base miencrafty server jar. I've been searching online for a while and haven't been able to solve this problem. I can provide any information with images, I just don't know what is needed. I have tested this on forge servers of multiple different versions and without any mods and those didn't work either. This is rather annoying because just a week ago when I tested it, it worked completely fine. Any help would be greatly appreciated