> ## Documentation Index
> Fetch the complete documentation index at: https://apidocs.erlc.gg/llms.txt
> Use this file to discover all available pages before exploring further.

# API Error Codes

When the ER:LC API encounters a problem, it returns a JSON response body containing an error code. Use this reference to identify the cause of an error and determine the appropriate action for your application to take.

## Error code table

<AccordionGroup>
  <Accordion title="System errors (0, 1001, 1002)">
    | Code   | Meaning                                                                    |
    | ------ | -------------------------------------------------------------------------- |
    | `0`    | Unknown error occurred. If this persists, contact PRC via an API ticket.   |
    | `1001` | An error occurred communicating with Roblox or the in-game private server. |
    | `1002` | An internal system error occurred.                                         |
  </Accordion>

  <Accordion title="Authentication errors (2000–2004)">
    | Code   | Meaning                                                     |
    | ------ | ----------------------------------------------------------- |
    | `2000` | You did not provide a server-key.                           |
    | `2001` | You provided an incorrectly formatted server-key.           |
    | `2002` | You provided an invalid or expired server-key.              |
    | `2003` | You provided an invalid global API key.                     |
    | `2004` | Your server-key is currently banned from accessing the API. |
  </Accordion>

  <Accordion title="Request errors (3001–3002)">
    | Code   | Meaning                                                                       |
    | ------ | ----------------------------------------------------------------------------- |
    | `3001` | You did not provide a valid command in the request body.                      |
    | `3002` | The server you are attempting to reach is currently offline (has no players). |
  </Accordion>

  <Accordion title="Rate limit and access errors (4001–4003)">
    | Code   | Meaning                                                       |
    | ------ | ------------------------------------------------------------- |
    | `4000` | You are not authorized to perform this action on this server. |
    | `4001` | You are being rate limited.                                   |
    | `4002` | The command you are attempting to run is restricted.          |
    | `4003` | The message you are trying to send is prohibited.             |
  </Accordion>

  <Accordion title="Special codes (9998, 9999)">
    | Code   | Meaning                                                  |
    | ------ | -------------------------------------------------------- |
    | `9998` | The resource you are accessing is restricted.            |
    | `9999` | The module running on the in-game server is out of date. |
  </Accordion>
</AccordionGroup>

## Handling code 9999

Error code `9999` means the in-game module on the ER:LC private server is outdated. To resolve this, kick all players from the private server and retry your request.

## Handling code 0

If you receive error code `0` (unknown error) and it persists across multiple requests, open an API ticket in the ER:LC Discord server and include the details of your request so the team can investigate.