> ## Documentation Index
> Fetch the complete documentation index at: https://platform.stepfun.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Codes

This guide lists the error codes you may encounter from the API and describes their causes and recommended fixes.

## Common Error Codes

| Code | Reason                                                                                                                                                                                                                                                                  | Resolution                                        |
| :--: | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------- |
|  400 | Request parameters are invalid. Common causes: <br /> 1. Image cannot be downloaded <br /> 2. Image count exceeds the limit <br /> 3. The model does not support video input <br /> 4. Model does not exist or you lack permission <br /> 5. Parameter value is invalid | Check the docs and pass the parameters correctly. |
|  401 | Invalid authentication                                                                                                                                                                                                                                                  | Make sure you are using the correct API key.      |
|  402 | Insufficient balance                                                                                                                                                                                                                                                    | Add funds to your account.                        |
|  404 | Incorrect request path                                                                                                                                                                                                                                                  | Update the request path per the docs.             |
|  429 | Resource or rate limit exceeded, usually because requests are too frequent                                                                                                                                                                                              | Retry after a short delay.                        |
|  451 | The request or response content failed review                                                                                                                                                                                                                           | Modify the request and try again.                 |
|  500 | Server-side issue on our end                                                                                                                                                                                                                                            | Retry shortly; contact us if it persists.         |
|  503 | Server is currently overloaded                                                                                                                                                                                                                                          | Retry after a short delay.                        |