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

# Errors

> Status codes that the Enterprise LLM Endpoint returns, and what to do about each one.

The Enterprise LLM Endpoint uses standard HTTP status codes, so OpenAI SDKs raise their normal exceptions, for example `AuthenticationError` for `401`.

## Status codes

| Status | Meaning                                                                         | What to do                                                                                                                |
| ------ | ------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- |
| `400`  | The model rejected the request body, for example an unsupported parameter.      | Read `error.message`, then correct the request.                                                                           |
| `401`  | The API key is missing, wrong, or belongs to a different enterprise server.     | Send your enterprise API key as `Authorization: Bearer <key>`.                                                            |
| `402`  | The enterprise plan is stopped because of a payment problem.                    | Update your payment in the [ModelsLab dashboard](https://modelslab.com/dashboard).                                        |
| `403`  | The plan is not active: the trial expired, or the plan was cancelled or paused. | Buy or renew your [enterprise plan](https://modelslab.com/enterprise), or contact support.                                |
| `404`  | The path is not one of the endpoints that your plan allows.                     | Use `chat/completions`, `completions`, or `models`.                                                                       |
| `413`  | The request is larger than 30 MB.                                               | Send large files as a URL instead of base64. See [Files, Images and PDFs](/enterprise-api/llm-endpoint/files#size-limit). |
| `429`  | Too many requests reached the model at the same time.                           | Wait, then try again with backoff.                                                                                        |
| `502`  | The model did not respond in time.                                              | Try again. For long outputs, set `"stream": true`.                                                                        |
| `503`  | The endpoint is not set up yet.                                                 | Contact support.                                                                                                          |
| `5xx`  | The model had an error.                                                         | Try again with backoff.                                                                                                   |

## Error body

Errors from the endpoint and from the model use the OpenAI error format:

```json json theme={"theme":{"light":"github-light","dark":"github-dark"}}
{
  "error": {
    "message": "This enterprise plan is not active",
    "type": "modelslab_proxy_error",
    "code": 403
  }
}
```

Errors about the API key (`401`), payment (`402`), and an expired trial (`403`) use a short ModelsLab format:

```json json theme={"theme":{"light":"github-light","dark":"github-dark"}}
{
  "status": "error",
  "message": "Invalid enterprise API key for proxy server"
}
```