java.lang.NullPointerException 错误请 [重复]

问：

我真的是编码新手，我一直在尝试制作这个 Minecraft 插件。每次启动它时，我都会收到此错误。https://i.imgur.com/33lBHQr.png

这是“启动器。NitroLauncher.onEnable“类。

package launcher;

import org.bukkit.plugin.Plugin;
import org.bukkit.scheduler.BukkitRunnable;
import org.bukkit.plugin.java.JavaPlugin;

public class NitroLauncher extends JavaPlugin
{
    private NitroLaunch launch;
    private static NitroLauncher plugin;
    private ReflectiveOperationException e;

    public <Plugin> void onEnable() {
        NitroLauncher.plugin = this;
        try {
            this.launch = (NitroLaunch)Class.forName("me.R1J.nitro.NitroPlugin").asSubclass(NitroLaunch.class).newInstance();
            @SuppressWarnings("unchecked")
            Plugin plugin2 = (Plugin)this;
            new BukkitRunnable() {
                public void run() {
                    NitroLauncher.this.launch.launch(NitroLauncher.this);
                }
            }.runTask((org.bukkit.plugin.Plugin) plugin2);
        }
        catch (InstantiationException | IllegalAccessException | ClassNotFoundException ex2) {
            String str = e.getMessage(); ;
            ;
            e = new ReflectiveOperationException(str);;
            e.printStackTrace();
        }
    }

    public Object getValue(Object pojo) throws IllegalArgumentException
    {
      try {
        return _method.invoke(pojo, (Object[]) null);
      } catch (IllegalAccessException | InvocationTargetException e) {
        throw new IllegalArgumentException("Failed to getValue() with method "
            +getFullName()+": "+e.getMessage(), e);
      }
    }

    public void onDisable() {
        if (this.launch != null) {
            this.launch.shutdown();
        }
        this.launch = null;
        NitroLauncher.plugin = null;
    }

    public static NitroLauncher getPlugin() {
        return NitroLauncher.plugin;
    }
}

任何帮助将不胜感激！

谢谢