Errors CS0176, CS1503 CS1502

I have no idea what these errors mean and PLEASE don't criticize me for how "easy" these are, im not in the mood...:'(

All on line 12

W hile hovering over the 'Add' function, Monodevelop states "Unknown Resolve Error"

This is a Inventory system and im trying to add a item to the inventory when the stated events happen.

Code (csharp):

1.    
2. //-----------------------------Interaction Script----------------------------------
3. void ObtainItem(){
4.  
5.         _playerInventory = GetComponent<PlayerInventory>();
6.  
7.         if (_worldItemProperties.ItemQuantity > 1)
8.         {
9.             Interaction.text = "Obtained " + _worldItemProperties.ItemQuantity + _worldItemProperties.ItemName + "s!";
10.             Debug.Log ("Obtained " + _worldItemProperties.ItemQuantity + " " + _worldItemProperties.ItemName + "s!");
11.             if (_worldItemProperties.Respawn)
12.             {
13.                 _playerInventory.Inventory.Add(_worldItemProperties.ItemName); //This line adds a item when player presses a button
14.                 _worldItemProperties.gameObject.SetActive (false);
15.                         }
16.                }
17. }
18.  
19. //-----------------------------------WorldItemPropertiesScript--------------------------
20.     public string ItemName = "Cookies";
21.  
22. //-------------------------------PlayerInventory-------------------------------------
23. public class PlayerInventory : MonoBehaviour {
24.  
25.     //BergZerg Arcade Inventory tutorial 1 has been followed for the following result
26.     private static List<WorldItemProperties> _inventory = new List<WorldItemProperties>();
27.     public static List<WorldItemProperties> Inventory {
28.                 get{ return _inventory;}
29.         }
30. }
31.  

Please State if the following errors were easy or not and how you knew how to fix, im desperate...

 

error CS0176: Static member `PlayerInventory.Inventory' cannot be accessed with an instance reference, qualify it with a type name instead

Like the message says, the "Inventory" member of the PlayerInventory class has been declared as static here:

Code (csharp):

1.  
2. public static List<WorldItemProperties> Inventory {
3.  

That basically means that it belongs to the class itself, not to an instance of the class. Since _playerInventory is an *instance* of the PlayerInventory class, you can't use it to access the Inventory member. Instead, you need to reference it like:

Code (csharp):

1.  
2. PlayerInventory.Inventory
3. // note the *class* name is being used here, not an *instance* name
4.  

The CS1502 and CS1503 errors are both caused by the same issue. That is, the Inventory member is defined as a List of WorldItemProperties here:

Code (csharp):

1.  
2. public static List<WorldItemProperties> Inventory {
3.  

So, you can only "Add" a WorldItemProperty to Inventory. That's not what you're doing here:

Code (csharp):

1.  
2. _playerInventory.Inventory.Add(_worldItemProperties.ItemName);
3.  

You're trying to add an "ItemName" instead, which according to the error is a *string*. That's not going to work...

Jeff