# domain_taken

HTTP 409 · Projects and domains (SPEC §5, §5.1, §16, §19.2)

This domain is already attached to a Flatstack project. Remove it there first, or use a different domain.

## 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": "domain_taken",
    "message": "This domain is already attached to a Flatstack project. Remove it there first, or use a different domain.",
    "docsUrl": "https://flatstack.dev/docs/errors/domain_taken"
  }
}
```

[All error codes](/docs/errors)