# feature_unavailable

HTTP 501 · Requests and sign-in (SPEC §15.3, §20.1)

This Flatstack feature isn't available in your project yet.

## Does retrying help?

Not until something else changes. The message says what: a plan, an add-on, a setting or a role. The same request then works.

## The response

Every Flatstack error has this shape. `details`, when present, says more about this case.

```json
{
  "error": {
    "code": "feature_unavailable",
    "message": "This Flatstack feature isn't available in your project yet.",
    "docsUrl": "https://flatstack.dev/docs/errors/feature_unavailable"
  }
}
```

[All error codes](/docs/errors)