World broken, won't work when uploaded.

So my server was working fine at first. I was building something with my friends. Earlier today, the server just... crashed. No big deal I figured, I could restart it. I restart it, and the command prompt doesn't work, and I crash only a few seconds later. I think "maybe it's just a problem right now it might get fixed later" so I get off and come back later. It still doesn't work. Odd, okay, so I downloaded the important world and completely reset my server. I reinstalled all the plugins, and entered the world before uploading. It worked perfectly fine. I uploaded the world, and now it crashes again whenever I join. I have no idea whats causing this, I just wanted to build with my friends. Any help would be appreciated.