Problems when saving and loading with FileStream

Hello everybody. I'm having some File Sharing problems in unity. I need to save and load objects from a few Json files and even though I used StreamReader.Close(), it doesn't seem to work as it should. I'm a bit slow with those backend code stuff, so I really don't know what I'm doing wrong. Does anyone have any suggestion?

 using UnityEngine;
 using System.Collections;
 using System.IO;
 using System.Text;
 
 public class SaveLoadManager : MonoBehaviour {
         public SaveData saveData;
 
 
     public static SaveLoadManager manager;
 
     void Awake(){
         if (manager == null) {
             manager = this;
         } else if (manager != null) {
             Destroy (gameObject);
         }
         DontDestroyOnLoad (gameObject);
     }
         
 
     public static string LoadJsonAsResource(string path){
         string jsonFilePath = path.Replace (".json", "");
         TextAsset loadedJsonfile = Resources.Load<TextAsset> (jsonFilePath);
 
         return loadedJsonfile.text;
     }
 
 
     public string LoadJsonAsExternalResource(string path){
         path = Application.persistentDataPath + "/" + path;
         if (!File.Exists (path)) {
             return null;
         }
 
         StreamReader reader = new StreamReader (path);
         string response = "";
         while (!reader.EndOfStream) {
             response += reader.ReadLine();
         }
         return response;
         reader.Close ();
     }
 
     public void WriteJsonToExternalResource(string path, string content){
         
         path = Application.persistentDataPath + "/" + path; //caminho do arquivo
 
         FileStream stream = File.Create (path);//cria o arquivo
 
         byte[] contentBytes = new UTF8Encoding (true).GetBytes (content);//converting the string into bytes
         stream.Write(contentBytes,0,contentBytes.Length);//escreve os dados no arquivo
 
         stream.Close ();
     }
 
 
 }