Reports Error: WARNING: Invalid order by field "null": You can only order by the "Group By" field and/or the "Stacked" field

[Thalley Creek]

Hello,

If I choose not to sort, the pie chart in the first image below sorts how I would like but displays the error "Error: WARNING: Invalid order by field "null": You can only order by the "Group By" field and/or the "Stacked" field"

As shown in the second image, when I sort by the Group By field "Assigned To" as the error message indicates, the pie sorting is not ordered.

How can I correctly sort the pie chart without displaying an error?

Many thanks
-TC

[Adam Stout · Accepted solution]

Try switching to the old UI and removing the sort there.  Then save the report and switch back. The error should be gone.

[Thalley Creek]

I've been working on this pretty much all day and this was the solution.

Thank you so much!!

[Donald Small]

Thank you.  I would not have found this one.  Why does it only show in the classic UI?  Frustrating!