# package_slot_taken

> That base line already has an upgrade in this package.

**Upgrade already set** · HTTP 422

## What it means

That base line already has an upgrade in this package.

## What to do

Update the existing upgrade instead.

## Example

```json
{
  "type": "https://api.bymundi.com/problems/package_slot_taken",
  "title": "Upgrade already set",
  "status": 422,
  "detail": "That base line already has an upgrade in this package.",
  "code": "package_slot_taken",
  "requestId": "req_…"
}
```

How to read any error: [Errors guide](https://api.bymundi.com/docs/guides/errors.md).