Help with crafting system.

Hello unity3d community, I am in need of assistance, whenever I use my craft() function in my game, it says "invalid items", in the console(which it is supposed to say when not enough items are present in InventoryItems to craft an item), and then it does not craft, even if I do have enough items. This is really frustrating. Please help!!!

Code:

     using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
 public class PlayerInventory : MonoBehaviour {
     
     public int MaxInventory = 26;
     
     public List<Item> InventoryItems = new List<Item>();
     
     void OnGUI(){
         if (GUILayout.Button ("+5 Wood")) {
             AddItem(ItemConstructors.Wood());
             AddItem(ItemConstructors.Wood());    
             AddItem(ItemConstructors.Wood());    
             AddItem(ItemConstructors.Wood());    
             AddItem(ItemConstructors.Wood());
         }
         if (GUILayout.Button ("Craft Wall")) {
             Craft(CraftingRecipes.WoodenWall());
         }
         
     }
     
     
     public void AddItem(Item _item){
         if (InventoryItems.Count < MaxInventory) {
             InventoryItems.Add(_item);
             SaveItems();
         }
     }
     
     public void RemoveItem(Item _item){
         InventoryItems.Remove (_item);
     }
     
     public void UseItem(Item _item){
         if (_item.ItemType == "Food") {
             ConsumeItem(_item);
         }
         SaveItems();
     }
     
     public void ConsumeItem(Item _item){
         if (_item.ItemDur > 1) {
             _item.ItemDur--; 
         }
         else if(_item.ItemDur <= 1){
             RemoveItem(_item);
         }
     }
     
     public void SaveItems(){
         for (int i = 0; i<MaxInventory; i++) {
             PlayerPrefs.SetString("Itemn"+i,InventoryItems[i].ItemName); 
             PlayerPrefs.SetString("Itemt"+i,InventoryItems[i].ItemType);
             PlayerPrefs.SetInt("Itemv"+i,InventoryItems[i].ItemValue);
             PlayerPrefs.SetInt("Itemd"+i,InventoryItems[i].ItemDur);
         }
         LoadItems ();
     }
     public void LoadItems(){
         InventoryItems.Clear();
         for (int i = 0; i<MaxInventory; i++) {
             Item it = new Item();
             it.ItemName = PlayerPrefs.GetString("Itemn"+i);
             it.ItemType = PlayerPrefs.GetString("Itemt"+i);
             it.ItemValue = PlayerPrefs.GetInt("Itemv"+i);
             it.ItemDur = PlayerPrefs.GetInt("Itemd"+i);
             if(it.ItemName.Length <= 2 && it.ItemType.Length <= 2){
             }
             else{
                 InventoryItems.Add(it);
             }
         }
     }
     
     public void Craft(CraftingItem Recipe){
         bool canCraft = ContainsAllItems (InventoryItems,Recipe.InputItem);
         if(canCraft){
             if(InventoryItems.Count < MaxInventory){
                 List<Item> list = new List<Item>();
                 list = InventoryItems.Except(Recipe.InputItem).ToList();
                 InventoryItems = list;
                 AddItem(Recipe.OutputItem);
             }
             else{
                 Debug.Log("Not enough space!");
             }
         }
         else{
             Debug.Log("Invalid Items.");
         }
     }
 
     public static bool ContainsAllItems(List<Item> a, List<Item> b)
     {
         return !b.Except(a).Any();
     }
     
 }

Other scripts;

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class CraftingItem
 {
     public Item OutputItem = new Item();
     public List<Item> InputItem = new List<Item>();
 }
 
 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public static class CraftingRecipes {
 
     public static CraftingItem WoodenWall(){
         CraftingItem ct = new CraftingItem ();
         ct.InputItem.Add (ItemConstructors.Wood());
         ct.InputItem.Add (ItemConstructors.Wood());
         ct.OutputItem = ItemConstructors.WoodenWall ();
         return ct;
     }
 
     public static CraftingItem StoneWall(){
         CraftingItem ct = new CraftingItem ();
         ct.InputItem.Add (ItemConstructors.Stone());
         ct.InputItem.Add (ItemConstructors.Stone());
         ct.OutputItem = ItemConstructors.StoneWall ();
         return ct;
     }
 
     public static CraftingItem FirePit(){
         CraftingItem ct = new CraftingItem ();
         ct.InputItem.Add (ItemConstructors.Wood());
         ct.InputItem.Add (ItemConstructors.Stone());
         ct.OutputItem = ItemConstructors.FirePit ();
         return ct;
     }
 
 }
 using UnityEngine;
 using System.Collections;
 
 [System.Serializable]
 public class Item
 {
     public string ItemName = "";
     public string ItemType = "";
     public int ItemValue = 0;
     public int ItemDur = 0;
 }

(Just the wood and woodenwall of item constructor)

 public static Item Wood(){
         Item it = new Item ();
         it.ItemName = "Wood";
         it.ItemType = "Crafting";
         it.ItemDur = 1;
         it.ItemValue = 1;
         return it;
 }
 
 public static Item WoodenWall(){
         Item it = new Item ();
         it.ItemName = "Wooden Wall";
         it.ItemType = "Build";
         it.ItemDur = 100;
         it.ItemValue = 1;
         return it;
     }