Creating a report, a report chart and a dashboard. I have completed everything and when I check it, I get the message: We couldn't find a report chart of type 'Donut'. What do I have to do?

I am having the same issue. I have gone over the solution steps offered here and am still getting the error message "We couldn't find a report chart of type 'Donut'." I have completed the challenge several times and am still missing something here. :(