Problem Ultimate server joining error

[cdauber]

I had a Direwolf20 server running on my computer, and i just changed it to the ultimate pack. But now I can't join it, and neither can anyone else. On the server log, it says
[INFO] User cdauber connecting with mods( I remove them to save space)
[INFO] cdauber[/127.0.0.1:55240] logged in with entity id 171 at (176.35303666395927, 128.0, -274.2300455058029)
[WARNING] Can't keep up! Did the system time change, or is the server overloaded?
[WARNING] Can't keep up! Did the system time change, or is the server overloaded?
[INFO] cdauber lost connection: disconnect.genericReason

All I get on my screen is a black screen, and it doesn't go away until I close out of the program. On the launcher's console, i get this weird message: http://pastebin.com/GQrWX262 (skip to line 836).

Can anyone help me?

 

[dedbbs]

Did you edit your server.properties to the settings of the previous server? If you used a custom port before and didn't change your server.properties to match, then that could be an issue. Is your port being forwarded correctly, both through your router and any software firewall? I don't see what's strange about line 836

2013-03-16 21:30:08 [INFO] [STDOUT] Connecting to localhost, 25565
Assuming your server is being hosted on the same computer as your client, there's nothing about it that initially appears to me to be an odd message. How are you putting in your server information to connect to your server in the client? Are you putting in localhost or are you putting in your external IP or are you using the loopback ip 127.0.0.1? It is possible that this is a weird message and that the reason you're getting it is because you have put something into the server-ip= line in server.properties. Leave everything after hte = sign blank on that line. It can cause problems.

If everything appears to be correct still, I'm wondering did you import your previous world into Ultimate? If you did, did you copy the whole world folder and make sure to point to it in server.properties (under level-name=)?

It's possible that old player data from the Direwolf20 server is causing a serious conflict and making people disconnect. Backup your entire server folder and try deleting your username.dat file from the server/worldname/players folder and then logging in. If this works, delete everyone's user information and do damage control by replacing people's missing inventories with creative mode.
If this all still doesn't seem to work, make a new folder and start a brand new ultimate server and see if people are able to connect with a completely fresh server. If this works, there's something else going on and you may either want to consider running the server with Direwolf20 and manually adding the mods from Ultimate that are missing or starting fresh with a new Ultimate world.

 

[cdauber]

I tried all of that, and it still didn't work. I imported the old server.properties file, as well as the world, and that didn't work. Also, line 836 is where the error messages start. I am also putting in localhost to join it. And i don't think it is the player files, because no one can join, not just me. I guess i will either start the server over or just keep it on Direwolf20 for now. Thank you for your help