Player Skins Won't Load

I'm making a character shop where the player can buy different players with currency.

However, the currency won't show and the skins won't spawn.

I'm following this tutorial.

My code:

SkinMenu.

 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;
 using System.Collections;
 
 public class LevelData 
 {
     public LevelData (string levelName)
     {
         string data = PlayerPrefs.GetString(levelName);
         if(data == "")
             return;
 
         string[] allData = data.Split ('&');
         bestScore = float.Parse (allData[0]);
         SilverScore = float.Parse (allData[1]);
         GoldScore = float.Parse (allData[2]);
     }
     public float bestScore { set; get; }
     public float GoldScore { set; get; }
     public float SilverScore { set; get; }
 }
 
 public class SkinMenu : MonoBehaviour {
 
     private const float CAMERA_TRANSITION_SPEED = 3.0f;
 
     public GameObject levelButtonPrefab;
     public GameObject levelButtonContainer;
     public GameObject shopButtonPrefab;
     public GameObject shopButtonContainer;
 
     public Text currencyText;
 
     public Material playerMaterial;
 
     private bool nextLevelLocked;
 
     private Transform cameraTransform;
     private Transform cameraDesiredLookAt;
 
     private int[] costs = {0, 150, 300};
 
 
 
     // Use this for initialization
     private void Start () {
         //PlayerPrefs.DeleteAll ();
         ChangePlayerSkin (SkinManager.Instance.currentSkinIndex);
         currencyText.text = "Currency : " + SkinManager.Instance.currency.ToString ();
         cameraTransform = Camera.main.transform;
 
         Sprite[] thumbnails = Resources.LoadAll<Sprite> ("Levels");
 
         foreach (Sprite thumbnail in thumbnails)
         {
             GameObject container = Instantiate (levelButtonPrefab) as GameObject;
             container.GetComponent<Image> ().sprite = thumbnail;
             container.transform.SetParent (levelButtonContainer.transform, false);
             LevelData level = new LevelData (thumbnail.name);
             container.transform.GetChild (0).GetChild(0).GetComponent<Text>().text = (level.bestScore != 0.0f) ? level.bestScore.ToString("F") : "LOCKED";
 
             container.transform.GetChild (1).GetComponent<Image>().enabled = nextLevelLocked;
 
 
             container.GetComponent<Button> ().interactable = !nextLevelLocked;
             if(level.bestScore == 0.0f)
             {
                 nextLevelLocked = true;
             }
             string sceneName = thumbnail.name;
             container.GetComponent<Button> ().onClick.AddListener (() => LoadLevel (sceneName));
         }    
         
                 int textureIndex = 0;
                 Sprite[] textures = Resources.LoadAll<Sprite> ("Player");
                 foreach (Sprite texture in textures)
                 {
                     GameObject container = Instantiate (shopButtonPrefab) as GameObject;
                     container.GetComponent<Image> ().sprite = texture;
                     container.transform.SetParent (shopButtonContainer.transform, false);
 
                     int index = textureIndex;
                     container.GetComponent<Button>().onClick.AddListener (() => ChangePlayerSkin(index));
             container.transform.GetChild (0).GetChild(0).GetComponent<Text>().text = costs [index].ToString();
             //container.transform.GetComponentInChildren<tExt>()
                     if((SkinManager.Instance.skinAvailability & 1 << index) == 1 << index)
                     {
                     container.transform.GetChild (0).gameObject.SetActive (false);
                     }
                     textureIndex++;
                 }
     }
 
     private void Update () 
     {
                     if(cameraDesiredLookAt !=null)
                     {
             cameraTransform.rotation = Quaternion.Slerp (cameraTransform.rotation, cameraDesiredLookAt.rotation, 3 * Time.deltaTime);
                     }
     }
     private void LoadLevel (string sceneName)
                 {
                     SceneManager.LoadScene (sceneName);
                 }
     private void LookAtMenu(Transform menuTransform)
                 {
                     cameraDesiredLookAt = menuTransform;
                 }
     private void ChangePlayerSkin(int index)
     {
         if ((SkinManager.Instance.skinAvailability & 1 << index) == 1 << index) {
 
             float x = (index % 4) * 0.25f;
             float y = ((int)index / 4) * 0.25f;
 
             if (y == 0.0f)
                 y = 0.75f;
             else if (y == 0.25f)
                 y = 0.5f;
             else if (y == 0.50f)
                 y = 0.25f;
             else if (y == 0.75f)
                 y = 0f;
 
             playerMaterial.SetTextureOffset ("_MainTex", new Vector2 (x, y));
 
             SkinManager.Instance.currentSkinIndex = index;
             SkinManager.Instance.Save ();
         } else {
             //don't have the skin wanna buy it?
             int cost = costs [index];
             //Debug.Log (cost);
             if (SkinManager.Instance.currency >= cost) {
                 SkinManager.Instance.currency -= cost;
                 SkinManager.Instance.skinAvailability += 1 << index;
                 SkinManager.Instance.Save ();
                 currencyText.text = "Currency : " + SkinManager.Instance.currency.ToString ();
                 shopButtonContainer.transform.GetChild (index).GetChild (0).gameObject.SetActive (false);
                 ChangePlayerSkin (index);
             }
         }
                         
     }
 
 
 
 
 
 }    

SkinManager.

 using UnityEngine;
 using System.Collections;
 
 public class SkinManager : MonoBehaviour {
 
     private static SkinManager instance;
     public static SkinManager Instance { get { return instance; } }
 
     public int currentSkinIndex = 0;
     public int currency = 0;
     public int skinAvailability = 1;
 
     private void Awake()
     {
         instance = this;
         DontDestroyOnLoad (gameObject);
 
         if (PlayerPrefs.HasKey ("CurrentSkin")) {
             // We had a previous session
             currentSkinIndex = PlayerPrefs.GetInt("CurrentSkin");
             currency = PlayerPrefs.GetInt("Currency");
             skinAvailability = PlayerPrefs.GetInt("SkinAvailability");
         } else {
             Save ();
         }
     }
 
     public void Save ()
     {
         PlayerPrefs.SetInt ("CurrentSkin", currentSkinIndex);
         PlayerPrefs.SetInt ("Currency", currency);
         PlayerPrefs.SetInt ("SkinAvailability", skinAvailability);
     }
 }