Spigot/Bukkit Errors

When trying to load my plugin I get these errors:

Code:

Error: Could not find or load main class com.electric_cosmos.plugin.SpigotPlugin
Caused by: java.lang.NoClassDefFoundError: org/bukkit/event/Listener

I followed this on setting up my plugin: https://www.spigotmc.org/wiki/creating-a-blank-spigot-plugin-in-eclipse/

And I was thinking about using falling blocks in my plugin ()

Here is my main class code:

Code:

package com.electric_cosmos.plugin;

import org.bukkit.plugin.*;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.event.*;
import org.bukkit.event.entity.*;
import org.bukkit.block.*;

public class SpigotPlugin extends JavaPlugin implements Listener {
    public static void main(String[] args) {
        System.out.println((float) -5 + (float) (Math.random() * ((5 - -5) + 1)));
    }
   
    public void onEnable() {
        PluginManager pm =getServer().getPluginManager();
        pm.registerEvents(new SpigotPlugin(), new SpigotPlugin());
    }
           
    @EventHandler
    public void onEntityExplode(EntityExplodeEvent event) {
        for (Block b : event.blockList()) {
            float x = (float) -5 + (float) (Math.random() * ((5 - -5) + 1));
        }
    }
}

My "plugin.yml":

Code:

name: Test-Spigot
main: "com.electric_cosmos.plugin.SpigotPlugin"
version: "1.0-SNAPSHOT"
api: "1.3"
api-version: 1.3

 

Yeah, I think I forgot that step, it works after I exported it

 

I don't see how.

Code:

pm.registerEvents(new SpigotPlugin(), new SpigotPlugin());

That should crash your plugin with a "plugin already initialized" error. You cannot instantiate new instances of the class that extends JavaPlugin. If you want to register listeners for the main class, you just do:

Code:

pm.registerEvents(this, this);

...just like they do in the tutorial you said you watched