i saw you are getting error with setting up the Facebook Shop. i would love to help.
For setting up Facebook shop you need to setup your Catalog of your shopify store with your facebook page.
For doing that there are couple of apps you can use even you can use shopify native setting to setup the catalog.
But as a Facebook Marketer i Suggest you WinAds.
Its a 1 click setup, this app will setup your catalog with just 1 click and if you wanted to setup pixel tracking on your store as well, its a 1 click job for that app.
Do check them out, :) https://apps.shopify.com/win-ads-manager