Your Main Class Blank Plugin

Your main class should look something like this:

 package me.[your ign or other name].code;
 import org.bukkit.plugin.java.JavaPlugin;
   public class SpigotTestPlugin extends JavaPlugin {
       // Called upon when plugin is first enabled
       @Override
       public void onEnable() {
      // Some code to do stuff
       }
       // Called upon when the plugin is disabled
       @Override
       public void onDisable() {
      // Some code to do stuff
       }
 }