The server is now running great, with mods and everything. Apparently (like you said) the world was corrupted and I just had to replace it. Thanks to everyone that helped, I couldn't fix this without you.
I deleted the world folder and now the server is running. In the files, the world folder does not exist, but the server is running fine. I wanted to see if anyone could check the log output to see if there were any problems I needed to fix, because I saw a lot of red.
https://pastebin.com/v2kRDhwP
I am sorry for the delay. When I run the .jar that holds the minecraft server, it works, but without mods. when I try to run the Forge jar, It does not work. How do I get the Forge .jar to run with the server?
So, I think I messed up. I took the instructions a bit too literal and deleted everything in the base directory, then put the forge files in. Still didn't work. https://pastebin.com/m5Khf6Ep
I followed all of the steps, and started the server. When It ran, it still crashed. But there is no crash or debug log from that. (Which is new.) It says, "Looks like a crash, check the server console. Return value: 1"
Anvilnode is hosting my server, and the option I have now is the highest, also the recommended version on the forge website. As far as I know, I can't update it any further.