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

# Errors

> After processing a request, Horizon returns a success or error response to the client. A success response will return a Status Code of 200, and an error response will return a Status Code in the range of 4XX - 5XX along with additional information about why the request could not complete successfully.

There are two categories of errors:

| Error Categories | |
| - | - |
| [HTTP Status Codes](https://developers.stellar.org/docs/data/apis/horizon/api-reference/errors/http-status-codes) | Errors that occur at the Horizon Server level. |
| [Result Codes](https://developers.stellar.org/docs/data/apis/horizon/api-reference/errors/result-codes) | Errors that occur at the Stellar Core level. |

Result Codes only follow a Transaction Failed (400) HTTP Status Code.