Inventory master no slotscript.cs?

hello i found this awesome Inventory asset in the asset store that i want to use in my game and im having some issues getting it running correctly. for some reason i and getting this error. I did set the slot container variable to "Slot - Inventory" in the Inventory Script. Im not sure if that is correct The error highlights the equiptment system in he hierarchy

 UnassignedReferenceException: The variable SlotContainer of Inventory has not been assigned.
 You probably need to assign the SlotContainer variable of the Inventory script in the inspector.
 Inventory.updateItemList () (at Assets/InventoryMaster/Scripts/Inventory/Inventory.cs:281)
 Inventory.Start () (at Assets/InventoryMaster/Scripts/Inventory/Inventory.cs:101)

https://www.assetstore.unity3d.com/en/#!/content/26310

Im not sure why its happening i copied the example that came in the asset so i would assume that it should work as soon as i set all of the variables in the inventory script. Im not having any luck.

https://www.youtube.com/watch?v=dBBLq02bhNs

here is the youtube video that goes with the development of the asset. which is a + in this video you can see the developer creating a SlotScript.cs file and when i go to import this asset into my game i can not see the script in the scripts directory.