Empty Table / Bad Request / Invalid Expression

Hi everyone,

So i have finally figured out how to pull data from Project Sites in Project Online (following this link -Want to query cross #project site #SharePoint lists in #ProjectOnline / #ProjectServer ? #PowerBI #PowerQuery #BI #Office365 #Excel #PPM – Modern Work Management – Project and the Power Platform blog (wordpress.com)) 

However, it now either says my table is empty, or if i try to pull columns through it says i have a 'Bad Expression' and the data is invalid. Below is the code i am using.  It doesn't seem to like the bit after 'Select'.  If i don't include anything in that bit, it pulls through the table but it then says This Table Is Empty and doesn't allow me to select any columns.  Anybody know how to fix this?

let ActionLog = (site as text) =>
let
Source = OData.Feed(site&"/_api/web/lists/GetByTitle('Action%20Log')/Items()"$?Select=Action%20Description,Action%20Owner, null, [Implementation="2.0"])
in
Source
in ActionLog