> For the complete documentation index, see [llms.txt](https://docs.hiveauth.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hiveauth.com/has-for-wallets-pksa/authentication/errors.md).

# Errors

If for any reason the **PKSA** fails to process the authentication request, it can inform the **HAS** with the following message:

### auth\_err

```javascript
{
    cmd: "auth_err",
    uuid: string,
    error: string,
    pok: string
}
```

{% tabs %}
{% tab title="Properties" %}

* **`uuid`**: the request identifier
* **`error`**: an error message encrypted with the `auth_key`
* **`pok`**: the `uuid` encrypted using the account private key and the HAS server public key (see [Proof of Key](/has-for-wallets-pksa/proof-of-key.md))
  {% endtab %}
  {% endtabs %}