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

# Error Codes

> List of API errors and their description

### SendLayer API Error Codes

If your API call is unsuccessful, an error code and message will be returned in JSON. Below is a list of the error codes:

| Code | Message                                                                                                                   |
| ---- | ------------------------------------------------------------------------------------------------------------------------- |
| 1    | Missing SenderAPIKey                                                                                                      |
| 2    | Missing FromName                                                                                                          |
| 3    | Missing FromEmail                                                                                                         |
| 4    | Missing ReplyToName                                                                                                       |
| 5    | Missing ReplyToEmail                                                                                                      |
| 6    | Missing ToName                                                                                                            |
| 7    | Missing ToEmail                                                                                                           |
| 8    | Missing Subject                                                                                                           |
| 9    | Missing ContentType                                                                                                       |
| 10   | Missing HTMLContent                                                                                                       |
| 11   | Missing PlainContent                                                                                                      |
| 12   | Invalid user                                                                                                              |
| 13   | Invalid sender API key                                                                                                    |
| 14   | Recipient email is suppressed                                                                                             |
| 15   | Invalid TemplateID                                                                                                        |
| 16   | Invalid TargetListID                                                                                                      |
| 17   | Email quota reached                                                                                                       |
| 18   | Recipient name or email address is missing                                                                                |
| 19   | Recipient email address is invalid                                                                                        |
| 20   | There is no recipient set for the email **OR** The number of recipients exceeds the allowed recipient email address count |
| 21   | CC name or email address is missing                                                                                       |
| 22   | CC email address is invalid                                                                                               |
| 23   | Invalid from email address format                                                                                         |
| 24   | BCC email addresses must be set as an array                                                                               |
| 25   | BCC name or email address is missing                                                                                      |
| 26   | BCC email address is invalid                                                                                              |
| 27   | The number of BCC email addresses exceed the allowed email address count                                                  |
| 28   | Reply-To email addresses must be set as an array                                                                          |
| 29   | Reply-To name or email address is missing                                                                                 |
| 30   | Reply-To email address is invalid                                                                                         |
| 31   | The number of Reply-To email addresses exceed the allowed email address count                                             |
| 32   | Domain is not activated                                                                                                   |
| 404  | Resource not found                                                                                                        |
| 422  | Invalid request parameters                                                                                                |
| 429  | Too many requests                                                                                                         |

### Example Error Response

```json theme={null}
{
    "Errors": [
        {
            "Code": 13,
            "Message": "Invalid SenderAPIKey"
        }
    ]
}
```