Fatal error: Uncaught Error: Class "core\task\adhoc_task" not found in C:\Apache24\htdocs\moodle\admin\tool\langimport\classes\task\install_langpacks.php:27 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\moodle\admin\tool\langimport\classes\task\install_langpacks.php on line 27