# Which error related events does the player expose

THEOplayer exposes different types of errors. Refer to "[How to do error handling](https://docs-preview.optiview.dolby.com/pr-860/theoplayer/v10/how-to-guides/miscellaneous/error/how-to-do-error-handling.md)" for information on how to programmatically detect an `error` event through an event listener.

Note that only the `error` events in the "Player API" are fatal. Error events dispatched in different APIs (e.g. Ads API) are considered non-fatal, because some level of playback might still be possible, or the video player might recover from it.

| API                    | Event                                        | Use                                                                            | Example/how to trigger                                                           |
| ---------------------- | -------------------------------------------- | ------------------------------------------------------------------------------ | -------------------------------------------------------------------------------- |
| Player                 | error                                        | Triggered for media issues, NOT network issues                                 | A poorly encoded segment                                                         |
|                        | segmentnotfound (not on iOS + only for DASH) | A segment was not found                                                        | A 404 returned on a segment                                                      |
| Ads API                | aderror                                      | Something went wrong during ad handling                                        | Empty ad tag / Adblocker                                                         |
| Network API (web only) | offline                                      | Thrown to indicate that the stream is offline                                  | DASH: take whole stream offline<br /><br />HLS: take 1 segment offline is enough |
| Chromecast API         | error                                        | Thrown to indicate that there was an error while casting / trying to cast      | Unplugged Chromecast power cable during casting                                  |
| Android Player API     | NoSupportedRepresentationFoundEvent          | Indicates that none of the provided representations is supported by the player | Trying to play a 4k stream encoded in AV1                                        |