Sum of impressions between FB ads and Google ads return error formula
I'm not really sure what I do wrong.
Inside Data Studio, I've create a blend data table. I blend FBads and Gads (both from Supermetric) using Month as the blend source.
Now I want to create a metric of the sum of Fbads impression and Gads impression, but when I "create a new field" and insert the formula of "Fbads impression + Gads impression", it says Formula error. Why is it?