Programming Errors Java (Minecraft)?

Hello people I'm new to programming. And can't find the mistake Would be nice could explain me the error Schonmal Thank you in advance.

This is the main class

That's the anticommand class

MFG: Julian (LofentBlack or end of school)

You will even see the error._.

1st picture below

I'm not a professional myself, but make it out of that

Plugin Manager pm = Bukkit.getPluginManager ();

pm.registerEvents (new AntiCommand (), this);

in the main class simply the following:

Bukkit.getPluginManager (). RegisterEvents (new AntiCommand (), this);

What is there, if you hover over the red mouse? Since you should be displayed the error ;-)