Cannot create json file to resources folder

Question

In my unity project I have Resources folder. I tried to create json file into Resources folder. But when I run the unity it says ArgumentException:..... I tried to use Application.dataPath .It successfully created in unity editor...in android it is not working. The reason why I use Resources Because I successfully read json file (which is already created) in android but I cannot create json file.

This is my simple Ciop.cs script

    using System.IO;
    using UnityEngine;
    using UnityEngine.UI;
    using LitJson;
    public class Ciop : MonoBehaviour {

        private JsonData itemData;
        private baaaaza nj;

        void Start () {

            nj = new baaaaza("eshhak");
            string jsn = Resources.Load<TextAsset>("Rr").text;
            itemData = JsonMapper.ToJson(nj);
            File.WriteAllText(jsn, itemData.ToString());
        }  
  }
    public class baaaaza
    {
        public string Name;
        public baaaaza(string name)
        {
            this.Name = name;
        }
    }