Lost Potentials Report - 'No data available' - Why?

Lost Potentials Report - 'No data available' - Why?

Within “Potentials” I have created multiple stages and their associated probabilities, sort order, forecast type and forecast category.  I have created a lot of potentials (50+), many of which have become 'Closed Lost' in forecast type.  So why does my “Lost Potentials” report have “No data available”?