Hello! My waffle chart gives me this error message as I added 2 more files to Tableau. I already made a primary key in the waffle excel file (Nation). However, it still gives me an error.
I'm not sure what should I do. I think I set the connection right. I'm wondering if someone can help please :(
Here's the error you're getting.
I didn't realize this until now, but it appears you cannot use blending when one of your data sources uses the new(ish) relationship model. Instead of using relationships, double-click into your table to get to the "physical layer" then set up physical joins instead of relationships.
That should eliminate the errors.
For more on the relationship model and how it differs from the physical model, see Tableau's New Data Model
