Save system not working

@Mavina

im getting a error for data.text please help

save system:

 using UnityEngine;
 using System.Collections;
 using System;
 using System.Runtime.Serialization.Formatters.Binary;
 using System.IO;
 using UnityEngine.UI;
 public class SaveSystem : MonoBehaviour {
     
     public static Text charText;
     public static int money;
     public static int cakeMultiplier;
     public static Text TextMoney;
     public static int CakesUpgrades;
     public static Text Cakes;
     public static int DVDSUpgrades;
     public static Text DVDS;
     public static int dvdMultiplier;
     public static int CDSUpgrades;
     public static Text CDS;
     public static int cdsMultiplier;
     public static int VideoGamesUpgrades;
     public static Text VideoGames;
     public static int videogamesMultiplier;
     
     public void SaveState()
     {
         BinaryFormatter bf = new BinaryFormatter();
         FileStream file = File.Create(Application.persistentDataPath + "/PlayerData.dat");
         
         PlayerData data = new PlayerData();
         
        
         data.text = UIInputField.charText.text;
         data.money = UpgradeCakes.money;
         data.cakeMultiplier = UpgradeCakes.cakeMultiplier;
         data.TextMoney = UpgradeCakes.TextMoney.text;
         data.Cakes = UpgradeCakes.Cakes.text;
         data.CakesUpgrades = UpgradeCakes.CakesUpgrades;
         data.DVDSUpgrades = UpgradeCakes.DVDSUpgrades;
         data.DVDS = UpgradeCakes.DVDS.text;
         data.dvdMultiplier = UpgradeCakes.dvdMultiplier;
         data.CDSUpgrades = UpgradeCakes.CDSUpgrades;
         data.CDS = UpgradeCakes.CDS.text;
         data.cdsMultiplier = UpgradeCakes.cdsMultiplier;
         data.VideoGamesUpgrades = UpgradeCakes.VideoGamesUpgrades;
         data.VideoGames = UpgradeCakes.VideoGames.text;
         data.videogamesMultiplier = UpgradeCakes.videogamesMultiplier;
         
         bf.Serialize(file, data);
         file.Close();
     }
     
     public void LoadState()
     {
         if(File.Exists(Application.persistentDataPath + "/PlayerData.dat"))
         {
             BinaryFormatter bf = new BinaryFormatter();
             FileStream file = File.Open(Application.persistentDataPath + "/PlayerData.dat", FileMode.Open);
             PlayerData data = (PlayerData) bf.Deserialize(file);
             file.Close();
             
             
             UIInputField.charText.text = data.text;
             UpgradeCakes.money = data.money;
             UpgradeCakes.cakeMultiplier = data.cakeMultiplier;
             UpgradeCakes.TextMoney.text = data.TextMoney;
             UpgradeCakes.CakesUpgrades = data.CakesUpgrades;
             UpgradeCakes.Cakes.text = data.Cakes;
             UpgradeCakes.DVDSUpgrades = data.DVDSUpgrades;
             UpgradeCakes.DVDS.text = data.DVDS;
             UpgradeCakes.dvdMultiplier = data.dvdMultiplier;
             UpgradeCakes.CDSUpgrades =  data.CDSUpgrades;
             UpgradeCakes.CDS.text = data.CDS;
             UpgradeCakes.cdsMultiplier = data.cdsMultiplier;
             UpgradeCakes.VideoGamesUpgrades = data.VideoGamesUpgrades;
             UpgradeCakes.VideoGames.text = data.VideoGames;
             UpgradeCakes.videogamesMultiplier = data.videogamesMultiplier;
             
             
             
             
             
            
         }
     }
 }
 
  [Serializable]
  class PlayerData
  {
      public string charText;
     public int money;
     public int cakeMultiplier;
     public string TextMoney;
     public int CakesUpgrades;
     public string Cakes;
     public int DVDSUpgrades;
     public string DVDS;
     public int dvdMultiplier;
     public int CDSUpgrades;
     public string CDS;
     public int cdsMultiplier;
     public int VideoGamesUpgrades;
     public string VideoGames;
     public int videogamesMultiplier;
  }