Google Merchant error "Missing sub-attribute [country (sub-attribute of [shipping])]"

[annnnn]

I'm getting this error on about 98% of my listings in Google Merchant.

"Missing sub-attribute [country (sub-attribute of [shipping])]"

I've googled endlessly and still can't figure out how to resolve it. I can't even tell if this is something I need to fix on shopify's side or in google merchant with a rule.

I also can't figure out how to see which listings the error is NOT on...thinking that might give me some clue as well. 

Any help would be appreciated because I'm completely lost on this one.