I added a Matrix to the report using the same dataset. Then, tried to group by Location and use an expression to get the counts for Yes and No's. I get this error.

The Value expression for the textrun 'Textbox26.Paragraphs[0].TextRuns[0]' has a scope parameter that is not valid for an aggregate function. The scope parameter must be set to a string constant that is equal to either the name of a containing group, the name of a containing region, or the name of a dataset.

I don't understand any of the error.