# engine_not_on_plan

HTTP 403 · Plan counts (SPEC §3.1, §3.2)

Postgres isn't on this plan. Upgrade to Pro or Studio to use it.

## 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.

## Already on the largest plan?

Studio is the largest plan. On Studio, use the message's other options, or email support@flatstack.dev and say what you need more of.

## The response

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

```json
{
  "error": {
    "code": "engine_not_on_plan",
    "message": "Postgres isn't on this plan. Upgrade to Pro or Studio to use it.",
    "docsUrl": "https://flatstack.dev/docs/errors/engine_not_on_plan"
  }
}
```

[All error codes](/docs/errors)