Java.lang.nullpointerexception

I'm attempting to run a modded server with a couple of friends, and I believe the mod lists are the same, so what's wrong? here's a list of the mods and the log. https://mclo.gs/33WlOo0

forgot to say this, but the game says java.lang.nullpointerexception whenever i try to join, and on the server list, there's a red X that says "Incompatible FML modded server, server mod list is unavailable"

Figured out the problem! turns out I had to redownload one of the mods, which was weird.