Error when starting up server

[Der_Cow]

Hi guys,

I have been running my server for a couple months now without incident.

Just this morning however, when I attempted to start my server, it began to start up until I got the following warning/error:

[WARNING] Could not get information about this CraftBukkit version; perhaps you are running a custom one?: FileNotFoundException

After that, it simply stops.

I've never had this problem before, and I haven't mucked with the server files at all. I tried researching the problem but couldn't find anything particularly helpful.

Thanks for your help guys.

Edit: I changed the name of the world in the server.properties file, and it seems to have worked fine after that. However, I would obviously prefer to keep my world file..