Help with the new Mobile Notification System in Unity

Hello guys, I am trying to implement the notification system on the application I am building. To be more specific I want the notification to fire in a specific date and time I specify by creating a DateTime object first. Then, I want to schedule a new notification by updating the previous one but an error is showing 10-06 17:50:54.079: E/Unity(9839): AndroidJavaException: java.lang.NoSuchMethodError: no static method with name='checkIfPendingNotificationIsRegistered' signature='(I)Z' in class Ljava.lang.Object; 10-06 17:50:54.079: E/Unity(9839): java.lang.NoSuchMethodError: no static method with name='checkIfPendingNotificationIsRegistered' signature='(I)Z' in class Ljava.lang.Object; 10-06 17:50:54.079: E/Unity(9839): at com.unity3d.player.ReflectionHelper.getMethodID(Unknown Source) 10-06 17:50:54.079: E/Unity(9839): at com.unity3d.player.UnityPlayer.nativeRender(Native Method) 10-06 17:50:54.079: E/Unity(9839): at com.unity3d.player.UnityPlayer.c(Unknown Source) 10-06 17:50:54.079: E/Unity(9839): at com.unity3d.player.UnityPlayer$e$2.queueIdle(Unknown Source) 10-06 17:50:54.079: E/Unity(9839): at android.os.MessageQueue.next(MessageQueue.java:398) 10-06 17:50:54.079: E/Unity(9839): at android.os.Looper.loop(Looper.java:142) 10-06 17:50:54.079: E/Unity(9839): at com.unity3d.player.UnityPlayer$e.run(Unknown Source) 10-06 17:50:54.079: E/Unity(9839): at UnityEngine._AndroidJNIHelper.GetMethodID (System.IntPtr jclass, System.String methodName, System.String signature, System.Boolean isStatic) [0x00041] in :0 10-06 17:50:54.079: E/Unity(9839): at UnityEngine.AndroidJNIHelper.GetMethodID (System.IntPtr javaClass, System.String methodName, System.String si.

Here is my code:

 void Start() { 

  var today = DateTime.Now;

  DateTime today_evening = new DateTime(today.Year, today.Month, today.Day, 14, 0, 0, 
  DateTimeKind.Utc);

  setEvening_Channel("3"); 

  setEvening_Notification(today_evening, "3");
  }

   public void setEvening_Channel(string id_e)
   {
     var evening = new AndroidNotificationChannel()
     {
         Id = id_e,
         Name = "Morning channel",
         Importance = Importance.High,
         Description = "Generic notification",
     };

     AndroidNotificationCenter.RegisterNotificationChannel(evening);
 }

    public void setEvening_Notification(DateTime tomo_even, string id_e)
    {
     
     //schedule the notification
     var notification_evening = new AndroidNotification();
     notification_evening.Title = "Just a Reminder";
     notification_evening.Text = "Don't forget to add today's meal";
     notification_evening.FireTime = tomo_even;

     evening_identifier = AndroidNotificationCenter.SendNotification(notification_evening, id_e);

     }

    private void OnApplicationPause(bool pause)
    {

      if (AndroidNotificationCenter.CheckScheduledNotificationStatus(evening_identifier) == 
       NotificationStatus.Delivered)
      {
         Debug.Log("DELIVERED STATUS ON EVENING NOTIFICATION");
         var today = DateTime.Now;
         //tommorows datetime strings
        

         var tommorow_evening = new DateTime(today.Year, today.Month, today.Day, 18, 0, 0, 
         DateTimeKind.Local);
         PlayerPrefs.SetString("tomorrow_evening", tommorow_evening.ToString());

         //  setMorning_Channel("4");

         var notification_evening = new AndroidNotification();
         notification_evening.Title = "Just a Reminder buddy";
         notification_evening.Text = "Don't forget to add today's meal";
         notification_evening.FireTime = tommorow_evening;
         AndroidNotificationCenter.UpdateScheduledNotification(evening_identifier, notification_evening,"3");
         Debug.Log("EVENING NOTIFICATION WAS UPDATED");
         }
       } 

The error is showing when I run the UpdateScheduledNotification method.