BinaryFormatter binaryFormatter = new BinaryFormatter();
            FileStream file = File.Open(Application.persistentDataPath + "/" + SceneManager.GetActiveScene().name + "Checkpoint.dat", FileMode.Open);
            CheckpointData data = (CheckpointData)binaryFormatter.Deserialize(file);
            data.Checkpoint = CheckpointNumber;
            Player.CheckpointNumber = CheckpointNumber;
            if (data.CheckpointUnlocked == CheckpointNumber - 1)
            {
                Player.CheckpointUnlocked = CheckpointNumber;
                data.CheckpointUnlocked = CheckpointNumber;
            }
            binaryFormatter.Serialize(file, data);
            file.Close();

BinaryFormatter binaryFormatter = new BinaryFormatter();
            FileStream file = File.Open(Application.persistentDataPath + "/" + SceneManager.GetActiveScene().name + "Checkpoint.dat", FileMode.Open);
            CheckpointData data = (CheckpointData)binaryFormatter.Deserialize(file);
            CheckpointNumber = data.Checkpoint;
            print(data.Checkpoint);
            CheckpointUnlocked = data.CheckpointUnlocked;
            print(data.CheckpointUnlocked);
            file.Close();