"Is it up to date?"-Error while testing my plugin

Hello everybody,

I was just creating a little plugin for this amazing Bukkit-Server.
Everything went right but when I tested the plugin on my server, the error came up.

This is, what I don't understand: I just made this plugin and used the newest Bukkit and newest other libraries but there is this fuckin' error.

What can I do to fix this?

 

Read this sticky: How to read stack-traces, and troubleshoot your own plugins (by yourself)

 

That error is more directed at server admins, not plugin developers. When an admin sees a plugin error, the first thing he should do is check for a new version of the plugin. That error message encourages them to do that.

As a developer, you should see that error and say, "Oops, I've done something wrong." Then you read the stack trace and figure out what the problem is.