Pipeline by Probability

Pipeline by Probability

Hi,
 
When I try to run this report I get an error saying 'please enter a valid field label in the row 1'
 
Please can someone advise what this means and how I go about fixing this?
 
I need to create a report showing the probability that is shown in the stage field depending on which stage is selected.  I have also looked at the Pipeline by stage report but is shows all potentials as 0% probability and I can't understand why!
 
Please advise.
 
Many thanks