Typical on-screen message:

“Playback stopped. The content being played is protected by Cinavia™ and is not authorized for playback on this device.
For more information, see http://www.cinavia.com.
Message Code 1.”
Typical front panel message:

“Cinavia™ playback restriction (1).”
Explanation

The audio track of the video that you are playing contains a Cinavia code indicating it was intended for presentation using professional equipment only (for example, in a theater) and is not authorized for playback by consumers.
Recommendations

If the video that you are playing is a professionally produced video (such as a movie or television show), you will need to obtain a copy that was made with the permission of the copyright owner.
If the video that you are playing back is a home movie or other personal recording, that includes some professionally produced content (including the audio track of a professionally produced movie or television show), you will need to either skip over the parts of the video that contain the professionally produced content during playback or else create or obtain a version of the video that does not include this protected material.