> For the complete documentation index, see [llms.txt](https://docs.nlx.ai/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nlx.ai/platform/developers/agentic-cx-designer-sdk/common-errors.md).

# Common Errors

### Common Errors

**ValidationException**

The input does not meet the required format or constraints. Check that all required parameters are included and that values are valid.

HTTP Status Code: 400<br>

**ResourceNotFoundException**

The specified resource does not exist. Verify the identifier and that the resource has not been deleted.

HTTP Status Code: 404

**ConflictException**

The request conflicts with an existing resource. For example, creating a secret with a name that already exists.

HTTP Status Code: 409

**AccessDeniedException**

The programmatic user does not have permission to perform this action. Check the user's role configuration.

HTTP Status Code: 403

**ThrottlingException**

The request rate is too high. The SDK automatically retries with exponential backoff.

HTTP Status Code: 429

**InternalServerException**

An internal error occurred. This is retryable. The SDK automatically retries these requests.

HTTP Status Code: 500

**SerializationException**

The request body could not be parsed. Verify that the request body is valid JSON.

HTTP Status Code: 400

### Error Response Shape

All errors return a consistent JSON body:

```
{
    "type": "ResourceNotFoundException",
    "message": "Secret 'my-secret' not found.",
    "resourceId": "my-secret",
    "resourceType": "Secret"
}
```


---

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