No One, Not Even Me, Can Log In To My Craftbukkit Server?

I had a 1.8 craftbukkit server, on an older 1.8.1 version of craftbukkit. Not even I was able to log into it, so I took the newest server files, and transferred over the world file and the nether world file, the lib folder (not sure what that is), the plugin folder (with just lockette, myhome, and ihateexp), and the server properties file. I started it up and I had the same problem, and no one is able to log in, including me. My ip is the same, I have checked, and the correct ports are forwarded.
Do I need to transfer more files over? Was I not supposed to transfer older files to a newer release?
Any help would be great, thanks.

Also, I can log into any other server just fine.

 

Post your server.log startup messages within Code tags and we might be able to see what's going wrong.

 

Also, when anyone tries to log in, it says "[IP] has been disconnected", not the username

 

It says IP disconnected and not username because the server is in Offline-Mode

 

Yeah, I have friends who wont pay for the game, and it normally runs fine in offline mode
Also, changing it to true didn't help...

 

have you tried connecting using your 127.0.0.1 alias? if that works let us know

 

how exactly do i do that?

 

put 127.0.0.1 as your server address in your client (if your using the same machine for both)

 

If you mean as the server ip in the properties file, i just tried it and it didnt work