# Custom error messages This example shows how to replace the default error messages of the player with your own messages, for example to show a friendlier message to your viewers, or to translate it into their language. Each error has a [`code`](https://docs-preview.optiview.dolby.com/pr-894/theoplayer/v11/api-reference/web/enums/ErrorCode) that you can use to pick the right message. Use the options below each player to load a stream that fails with a specific error, or a valid stream. ## Open Video UI Tip: open your browser's developer console and use the `player` and `THEOplayer` variables to interact with this demo. \[x]Missing stream (MANIFEST\_LOAD\_ERROR)\[ ]Unsupported source (SOURCE\_NOT\_SUPPORTED)\[ ]Valid stream (no error) Open Video UI shows the error message from its locale. Register a custom locale with `THEOplayerUI.addLocale()`, override its `errorHeading` and `errorMessage` properties, and set the `lang` attribute of the UI to the name of that locale. Code demo.html ```html Custom error messages ``` ## Legacy UI \[x]Missing stream (MANIFEST\_LOAD\_ERROR)\[ ]Unsupported source (SOURCE\_NOT\_SUPPORTED)\[ ]Valid stream (no error) The legacy UI (created with `new THEOplayer.Player()`) shows the error message in its error display. Listen for the `error` event on the player, and replace the text in the error display with your own message. Code legacy-ui.html ```html Custom error messages (legacy UI)
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