Fatal error: Uncaught Error: Class "core_grades\output\action_bar" not found in C:\Apache24\htdocs\moodle\grade\report\singleview\classes\output\action_bar.php:32 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\moodle\grade\report\singleview\classes\output\action_bar.php on line 32