# invalid

> The subscription frame on the terminal WebSocket (`/{mt4|mt5}/{id}/ws`) is invalid.

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

WebSocket error frame.

**Likely causes:**

- Unknown topic.
- A prices or bars topic without a symbol.

**What to do:** Fix the subscription frame.

**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.