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

# Errors

Copper Platform API returns machine-readable errors and human-readable messages.

Here is what an error response looks like:

```json theme={"system"}
{
  "error": "bad-request",
  "message": "Can't execute request"
}
```

### Common Error Codes

| Code | Error | Details |
| :- | :- | :- |
| 400 | Bad Request | Validation errors: empty required fields, unsupported values |
| 401 | Unauthorized | Invalid API Key |
| 403 | Forbidden | Access to the requested resource is denied |
| 404 | Not Found | The requested endpoint has not been found |
| 409 | Conflict | Validation error or the request cannot be completed due to an internal issue |
| 429 | Request Limit Exceeded | The request rate limit is exceeded. Request processing is temporarily blocked |
| 500 | Internal Server | Problems with the Copper platform server |


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