# Database Errors

## DBMS-1

The database system you've selected in your settings is not an accepted format that Saturn's Database Management System can understand. You'll need to change it to one of the accepted types:

| Type                | Description             | Minimum Version |
| ------------------- | ----------------------- | --------------- |
| `MySQLi` or `MySQL` | MySQLi Database System  | Saturn 1.0.0    |
| `PDO`               | PHP Data Objects System | Saturn 1.0.0    |

You can't use Saturn when this error message appears, and your website will refuse to load. You must edit the settings file using a file manager. To edit it navigate to your settings file (It's the Settings.php file in the Settings folder) and change `DB_TYPE` to one of the accepted values.

{% hint style="warning" %}
You'll need to [reset your settings file checksum](/1.0.0/troubleshooting/errors/checksum-issues.md#reset-your-settings-file-checksum) to stop the checksum error message from showing.
{% endhint %}

## DBMS-2

The requested action does not exist. Please check that the action is one of the accepted actions, [to see a full list please click here](/1.0.0/dev/libraries-and-functions/databasemanager.md#actions).

## DBMS-3

No result was gathered.

## DBMS-4

An unexpected error occured whilst executing the database query.


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If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.