Catchable fatal error: Argument 1 passed to AppBundle\Controller\Course\CourseSetController::getTagIdsByCourseSet() must be an array, null given, called in /var/www/aishe.st.edusoho.cn/src/AppBundle/Controller/Course/CourseSetController.php on line 115 and defined in /var/www/aishe.st.edusoho.cn/src/AppBundle/Controller/Course/CourseSetController.php on line 161