Grade calculation error displays multiple times.

You'll need a course with at least one student and at least two gradeable activities with ID numers. Visit the course and click on 'Grades'. Under 'Categories and items' click on 'Simple view'. Click 'Add grade item' and fill in the details and submit. After saving click on the calculator icon next to the newly created grade item and set the calculation to be equal to the sum of two other grade items ie =[ [idnumberA] ]+[ [idnumberB] ] Visit the course page and delete one of the activities that is relied upon by the calculated grade item. Click on 'Grades' which should take you to the 'User report' and ensure there is the message 'An error occurred during grade calculation: Probably circular reference or broken calculation formula' and not 'An error occurred during grade calculation: Probably circular reference or broken calculation formula,Probably circular reference or broken calculation formula'. Click on 'Export' to show the export options. Click on each of these and ensure the error message shows and is the same.