SSRS error after adding "total page numbers" in hidden fields?

Question

After I added two hidden text-boxes in the header and footer of my report, as shown here:

Then I got the following error:

which reads:

An error occurred during local report processing. The definition of the report /RPT_Resp_Answr is invalid. The tablix 'Tablix2' has a detail member with inner members. Detail members can contain only static inner members.

I'm confused at the part that says " Detail members can contain only static inner members" - is that referring to the page # part?

Answer 1

I figured it out now, when I tabbed into the "Tablix member" , there was a specifically referenced "detail member" under the "Row Groups" section.

So then I click the arrow ad say "Delete grop"