# not_supported

> This terminal backend does not provide the requested stream (stream error frame).

Source: https://tickwire.io/docs/errors/not_supported/

WebSocket error frame.

**Likely cause:** Market depth on a backend without it.

**What to do:** Unsubscribe from it.

**Retry:** No. The same request gets the same answer; change something first.

Listed under [Streaming](https://tickwire.io/docs/errors/#streaming) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.