Fatal error: Uncaught Error: Class "core\external\exporter" not found in C:\Apache24\htdocs\moodle\reportbuilder\classes\external\custom_report_card_view_exporter.php:33 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\moodle\reportbuilder\classes\external\custom_report_card_view_exporter.php on line 33