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were you attempting to edit original, cloned or copied view? No reports will be using freshly copied view and error should not reappear in that case; if it still does, your problem may be more serious. If not, maybe something mentioned in Walk-through: Exploring Smart Reporting DB Repository might help you find the cause of error.
Thank you for your response. I am getting this error on a cloned copy of the view. The fields exists on couple of join forms and trying to add the fields onto respective folders.
does this mean that issue doesn't appear on copied view? That would suggest you may have missed a report or two; did you use method suggested in cited blog to determine where are those problematic fields supposedly used?