Fatal error: Uncaught Error: Class "core_reportbuilder\local\aggregation\base" not found in C:\Apache24\htdocs\moodle\reportbuilder\classes\local\aggregation\sum.php:31 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\moodle\reportbuilder\classes\local\aggregation\sum.php on line 31