Pie Chart does not appear after selecting data field

SergeiBaklan I was having the same problem and it wasn't just the pie chart it was all the charts that I clicked on would not populate an image on the screen. I am a student and was doing a homework assignment in my Simnet e-line book and it wouldn't let me continue with any further questions until I completed that one. 

I was getting impatient and frustrated and so I thought well maybe I should scroll down and see if it is showing up below and there is was. I don't know how I rearranged the charts to show up beneath the chart list but somehow I did. 

I hope this helps someone in the future.