Server Help Having trouble hosting modded server on Linux.

So, I have everything set up properly, I think. I set it up using the steamcmd, using this tutorial, http://starbounder.org/Guide:LinuxServerSetup , but all this did was show me how to do the basic assets of the game and not mods. So i looked around on the forums some more and found a neat little command, steam>workshop_download_item 211820 <number of wanted mod>. I used this to install a couple of mods and i have the same mods installed correctly on the computer i'm trying to access the server from. In theory everything should work right? but then I get this error: "Exception caught in client main-loop (EofException) Failed to read full buffer in readFull, eof reached." I have no idea what this means. I restarted the server, although i'm not sure that's how linux works. I'm using linux mint, which is the same thing as ubuntu, just a different GUI, which i'm not using because it's a server.
Anyway, if you have any questions about my explanation, (I tried to be super detailed) just ask, any help would be very appreciated.