A message sent to the SUP server referenced a metadata container which either does not exist or is not assigned to that application.
| Domain | SUP Server MessageChannel Exception |
| Number | 404 |
| Label | NON_EXISTENT_RESOURCE |
| Applicable Platform(s) | iOS, Android, BlackBerry, Windows Mobile |
This error typically occurs when the "mdc" header parameter and the application connection's customization bundle ID are both empty.
Specify a valid "mdc" header parameter and a correct application connection's customization bundle ID.