Vibration for Unity3d with Android native Call, with fallback to Handlheld.Vibrate()

Vibration.cs

using UnityEngine;
using System.Collections;

public static class Vibration
{

#if UNITY_ANDROID && !UNITY_EDITOR
    public static AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    public static AndroidJavaObject currentActivity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
    public static AndroidJavaObject vibrator = currentActivity.Call<AndroidJavaObject>("getSystemService", "vibrator");
#else
    public static AndroidJavaClass unityPlayer;
    public static AndroidJavaObject currentActivity;
    public static AndroidJavaObject vibrator;
#endif

    public static void Vibrate()
    {
        if (isAndroid())
            vibrator.Call("vibrate");
        else
            Handheld.Vibrate();
    }


    public static void Vibrate(long milliseconds)
    {
        if (isAndroid())
            vibrator.Call("vibrate", milliseconds);
        else
            Handheld.Vibrate();
    }

    public static void Vibrate(long[] pattern, int repeat)
    {
        if (isAndroid())
            vibrator.Call("vibrate", pattern, repeat);
        else
            Handheld.Vibrate();
    }

    public static bool HasVibrator()
    {
        return isAndroid();
    }

    public static void Cancel()
    {
        if (isAndroid())
            vibrator.Call("cancel");
    }

    private static bool isAndroid()
    {
#if UNITY_ANDROID && !UNITY_EDITOR
	return true;
#else
        return false;
#endif
    }
}

'Vibration' is missing the class attribute 'ExtensionOfNativeClass'!
how to Solve this error.......
Unity 2020.3.17f1

Thank you😊

Doesn't expect this still work in 2022.
You're a hero

@SamKyada , read the reply by @agustinaA-Lopez

meanwhile 2023, Android14, copy, paste, works like a charm.
Thanks @aVolpe , you're the man...