Issue #49: Require tablelib.php

Author: petersistrom

classes/task/generate_report.php

@@ -19,6 +19,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 require_once($CFG->dirroot . '/course/lib.php');
+require_once($CFG->libdir.'/tablelib.php');
 
 use core\task\adhoc_task;
 use core\task\manager;