Having issue putting this into my server

Oxide.Ext.CarbonAliases is referenced by ShoppyStock plugin but is not loaded
Ignored unexpected plugin compilation failure: ShoppyStock
Error while compiling ShoppyStock: The type or namespace name 'CarbonAliases' does not exist in the namespace 'Oxide.Ext' (are you missing an assembly reference?) | Line: 32, Pos: 17

I keep getting this error 

Hey, on Oxide you need this: 

Thank you I got it in my server but I feel quite confused on how to set it up and change certain things anyway to get some help Id love to keep this plugin with how great it is

If you need any help with anything feel free to message me on discord, it's a lot faster than here to respond.