GUI error with texture.

My GUI button is having an error I have an code assigned texture and so on, but the only thing the button does is say Firewood(Unity Engine Texture) in stead of showing a texture2d,(Firewood is the texture file name). I don't know why, please help(My texture is 40x40, and so is the button). Cheers.

Heres the script:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class PlayerInventory : MonoBehaviour {
     
     public List<Item> items = new List<Item>();
     
     public string PrimaryS;
     public string SecondaryS;
     
     public Gun Primary;
     public Gun Secondary;
     [HideInInspector]
     public Texture2D gun1icon;
     [HideInInspector]
     public Texture2D gun2icon;
     
     public GUIStyle gunStyle;
     
     public GUIStyle itemStyle;
     
     private int rows = 4;
     private int cols = 4;
     
     private Rect windowRect = new Rect(150,150,200,300);
     
     private bool isWindow;
     
     public static PlayerInventory ins;
     
     // Use this for initialization
     void Start () {
     ins = this;
     }
     
     // Update is called once per frame
     void Update () {
 //    gun1icon = Resources.Load("Icons/" + PrimaryS);
 //    gun2icon = Resources.Load("Icons/" + PrimaryS);
         
     if(Input.GetKeyUp(KeyCode.G)){
         isWindow = !isWindow;
     }
     }
     
     void LateUpdate(){
         foreach(Item im in items){
         im.texture = Resources.Load("Icons/" + im._name) as Texture2D;
         im.BuiltPrefab = Resources.Load("Prefabs/" + im._name) as GameObject;
         }
     }
     
     void OnGUI(){
         //Start Item List
         if(isWindow)
         windowRect = GUI.Window(0,windowRect,WindowPlayer,"Gear");
         
     }
     
     public void AddAnItem(string nameofItem){
         Item temp = new Item();
         temp._name = nameofItem;
         temp.texture = Resources.Load("Icons/" + nameofItem) as Texture2D;
         temp.BuiltPrefab = Resources.Load("Prefabs/" + nameofItem) as GameObject;
         items.Add(temp);
     }
     
     public void RemoveItemFromList(int _PositionInList){
         items.RemoveAt(_PositionInList);
     }
     
     public void WindowPlayer(int windowID){
         if(GUI.Button(new Rect(25,20,150,50),"")){}
         if(GUI.Button(new Rect(25,75,150,50),"")){}
         
         int cnt = 0;
         for(int y = 0; y < rows; y++){
             for(int x = 0; x < cols; x++){
                 if(cnt < items.Count){
                     if(GUI.Button(new Rect(20 + x * 40, 130 + y * 40,40,40),"" + items[cnt].texture)){}
                 }
                 else{
                     GUI.Box(new Rect(20 + x * 40, 130 + y * 40,40,40),"");
                 }
                 cnt++;
             }
         }
         GUI.DragWindow();
     }
 }
 
 [System.Serializable]
 public class Item{
     public string _name;
     public Texture2D texture;
     public GameObject BuiltPrefab;
     public bool isCounted;
     public bool isCountedAsNull;
 }