fix

app/controllers/courses_controller.rb

@@ -133,7 +133,7 @@ class CoursesController < ApplicationController
 
     @count = course_videos.count("course_videos.id")
     logger.info("#######count:#{@count}")
-    course_videos = course_videos.select("course_videos.id, IFNULL(watch_courses.total_duration, 0) AS total_duration, IFNULL(watch_courses.count,0) AS count, course_videos.video_id, course_videos.title, course_videos.is_link, course_videos.user_id")
+    course_videos = course_videos.select("course_videos.id, IFNULL(watch_courses.total_duration, 0) AS total_duration, IFNULL(watch_courses.count,0) AS count, course_videos.video_id, course_videos.title, course_videos.link, course_videos.is_link, course_videos.user_id")
     @videos = paginate course_videos
   end