# add_on_in_use

HTTP 409 · Plan counts (SPEC §3.1, §3.2)

This add-on is in use. Remove what's listed in details, then try again.

## 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": "add_on_in_use",
    "message": "This add-on is in use. Remove what's listed in details, then try again.",
    "docsUrl": "https://flatstack.dev/docs/errors/add_on_in_use"
  }
}
```

[All error codes](/docs/errors)