The problem pages report shows you a listing of any pages on your site that may have an error on it. Typically when you check this report it is going to show that there are no errors to report.
If there is problem page, it will show it so you can check on the page to see what the error may be so that you can correct it. If you are unable to correct it, please open a support ticket so the support team can assist.
Click each tab for more information.
Under 'Reports' choose 'Problem Pages'
The page may show you 'No Errors to Report'
Or it will list the problem pages if there are any along with the date of the problem. The page can be clicked to visit the page directly.