This error message indicates that media has been deleted from your Library. The following error message displays "404 Not Found, The page you're looking for couldn't be found."
404 Not Found (seen by instructors and students)
Removing Media from EchoVideo
Deleting a video removes it from locations where it was published in Canvas. You will need to replace the deleted media by publishing a updated video.
Accidentally deleted your media? Go to your personal Recycle Bin to restore your EchoVideo content. Deleted media can be recovered for up to six months after deletion. All analytics and links to the media will be restored.