ERROR FETCHING COURSE DETAILS</br>SELECT id, course_name, course_desc, course_url, course_pass, course_final, ack FROM courses WHERE id = '0'ERROR lesson_DB:</br>SELECT id FROM lessons WHERE course_id = '0' AND lesson_type != 'heading'ERROR lesson_name:</br>SELECT lesson_name FROM lessons WHERE lesson_type = 'heading' AND course_id = '0'ERROR lesson_name:</br>SELECT id, lesson_name, lesson_url, lesson_type FROM lessons WHERE course_id = '0'