update not working

Failed compiling 'SkillTree.cs':
  1. 'BaseDiggableEntity' does not contain a definition for 'SpawnLootListItem' and no accessible extension method 'SpawnLootListItem' accepting a first argument of type 'BaseDiggableEntity' could be found (are you missing a using directive or an assembly reference?) [CS1061]
     (SkillTree 44 line 18757)

this is whats coming up in console and its not working, i have not wiped my server yet dont know if thats the issue or not.

Change 

var dItem = __instance.SpawnLootListItem(player) as DroppedItem;

to 

var dItem = __instance.SpawnItem(player) as DroppedItem;

And reload plugin