How to revert everything altered by the Binary Formatter?

Hi I am fairly new to coding save and load functions in Unity. I have been twiddling around with the Binary Format and eventually seem to have gotten my save files corrupted. When I tried to delete my codes and redo the script from start, I still get error messages even with scripts that worked before. Most of them relating to missing file. Is there a way to revert everything that has been altered by whatever happened through using the binary format?

Edit: Never mind I solved the problem, an on-trigger event from another script that is suppose to trigger the save function was disabled, thank you for your help.

edit(moved from answer)

@the_Whizzkid Thank you I will check out those software. Edit:Do not know why the comment came out discorganized. I will try to fix it.

Here are 2 errors I'm currently getting:

VoicC:/Users/peter/AppData/LocalLow/DefaultComapny/ChitonIV/player.save UnityEngine.Debug:LogError(object)

NullReferenceException: Object reference not set to an instance of an object MovmentII.LoadPlayer() (at Assets/Script/MovmentII.cs:97)

I can't figure out why I'm getting a Null Reference Exception because there weren't suppose to be any object I need to attach into the inspector for that code, it just started happening after I remove a chunk of binary script that wasn't working.

Here is the code the NullReference Exception is targetting:

 {
 IEnumerator SavePlayer()
 {
    yield return new WaitForSeconds(3.5f);
    SaveTrigger.SavePlayer(this);
   
 }

 public void LoadPlayer()
 {
    SaveData1 data = SaveTrigger.LoadPlayer();
     Vector3 position;
     position.x = data.position[0];    // The NullReference Exception points to this code but it didn't have this problem before.
     position.y = data.position[1];
     position.z = data.position[2];


 }

This is my Binary Format script, its the same one I got from one of Brackeyes's videos:

 {
   public static void SavePlayer(MovmentII player)
  {
      BinaryFormatter formatter = new BinaryFormatter();
      string path = Application.persistentDataPath + "/player.save";
      FileStream stream = new FileStream(path, FileMode.Create);
 
      SaveData1 data = new SaveData1(player);
 
      formatter.Serialize(stream, data);
      stream.Close();
  }
 
  public static SaveData1 LoadPlayer()
  {
      string path = Application.persistentDataPath + "/player.save";
      if (File.Exists(path))
      {
          BinaryFormatter formatter = new BinaryFormatter();
          FileStream stream = new FileStream(path, FileMode.Open);
 
          SaveData1 data = formatter.Deserialize(stream) as SaveData1;
          stream.Close();
 
          return data;
      }
      else
      {
          Debug.LogError("Void" + path);
          return null;
      }
 
 
  }
  
 
  public static  void DeleteSaveData()
  {
      File.Delete(Application.persistentDataPath + "/player.save");
  }
 }

This is one of the scripts I disabled:

{

 public static void SaveMove(MovmentII movement)
 {
      BinaryFormatter formatter = new BinaryFormatter();
      string path = Application.persistentDataPath + "/move.save";
     FileStream stream = new FileStream(path, FileMode.Create);
 
     NewMovementData data = new NewMovementData(movement);
 
      formatter.Serialize(stream, data);
      stream.Close();
  }
 
  public static NewMovementData LoadPlayer()
  {
    string path = Application.persistentDataPath + "/move.save";
     if (File.Exists(path))
      {
        BinaryFormatter formatter = new BinaryFormatter();
       FileStream stream = new FileStream(path, FileMode.Open);
        NewMovementData data = formatter.Deserialize(stream) as NewMovementData;
        stream.Close();
 
          return data;
      }
    else
      {
        Debug.LogError("No Save file" + path);
         return null;
     }
 }
  }
 }