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I know this is an old question but maybe this will help someone else. I received the same error and it was because I had conflicting conditions assigned for a set I created.
For example, I wanted to group student majors into an "other" category if there were less than 10 students in any major. The problem arose because I set that condition but also unknowingly had the option selected to take the "Top 10" majors. This created conflicting group by conditions. Once I unchecked the "Top 10" option I no longer received the error.
Just wanted to thank you for this post =), I was having this problem and it never crossed y mind that the set could be causing it, this pointed me in the right direction.