Saving game progress with JSON - LitJson Error

Hi guys, this is my first post here on the forum, sorry if I did something wrong ^^

Whenever I try to convert a list to json I get a error: "Max allowed object depth depth while trying to export from type UnityEngine.Vector3", and I have no idea how to solve this, I wish someone could help me and If you think there is a better way to do the game save please let me know.

Here is my code: (I'm using Litjson)

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using LitJson;
 using System.IO;

 public class ItemDatabase : MonoBehaviour {
 
     public List<Item> database = new List<Item> ();
     private JsonData itemData;
     private JsonData itemDataSave;
 
 void Start() 
     {
         ConstructItemDatabase ();
     }
 void SaveGame() 
         {
         **itemDataSave = JsonMapper.ToJson (database);**
         File.WriteAllText (Application.dataPath + "/StreamingAssets/Items.json", itemDataSave.ToString());
 
         }
 
     public void ConstructItemDatabase() 
     {
         itemData = JsonMapper.ToObject (File.ReadAllText (Application.dataPath + "/StreamingAssets/Items.json"));
         database.Clear ();
         for (int i = 0; i < itemData.Count; i++) 
         {
             database.Add (new Item ((int)itemData [i] ["id"], itemData [i] ["tipo"].ToString (), 
                 itemData [i] ["title"].ToString (), (int)itemData [i] ["nivel"], (int)itemData [i] ["value"], 
                 itemData [i] ["descricao"].ToString (), (int)itemData [i] ["quant"], (int)itemData [i] ["comestivel"]));
         }
     }
 }
 
 public class Item 
 {
     
     public int ID { get; set; }
     public string Tipo { get; set; }
     public string Title { get; set; }
     public int Nivel { get; set; }
     public int Value { get; set; }
     public Sprite Sprite { get; set; }
     public string Descricao { get; set; }
     public int Quant { get; set; }
     public int  Comestivel { get; set; }
 
     public Item(int id, string tipo, string title,int nivel, int value, string descricao, int quant, int comestivel) 
     {
         this.ID = id;
         this.Tipo = tipo;
         this.Title = title;
         this.Nivel = nivel;
         this.Value = value;
         this.Descricao = descricao;
         this.Quant = quant;
         this.Comestivel = comestivel;
         this.Sprite = Resources.Load<Sprite> ("Sprites/Items/" + title);
     }
 
     public Item() 
     {
         this.ID = -1;
     }
 }