Savannah here from Shopify. 🙂
This error commonly comes up when you've just recently set up Google Analytics but haven't received any orders yet. Is that the case? If so, I would recommend running a test transaction, and then checking for that error again.
If that doesn't do the trick, try taking a look at this doc and making sure that you've followed each step correctly.
Let me know how that goes or if you're still seeing the error!
Savannah | Social Care
Yes i have had a couple of sales and still getting the error. I read the document that you provided previously but the Shopify documents/instructions dont say to add the ecommerce plugin. All I saw was to add the google analytics tracking code and then make sure you turn on ecommerce in admin in GA.
The most common reason for this error is a small amount of sales. You'll probably get the warning if you haven't had a sale in a week or even a shorter period of time then that. If the order is processed via draft orders, that is not pushed in GA and would contribute to a longer period of no sales according to GA.