# Authentication Errors

#### Auth Failed (Code 400)

```json
{
  "code": 400,
  "message": "Auth Failed"
}
```

* **`code`**: Error code.
* **`message`**: Error message indicating authentication failure.

#### Unauthorized (Code 401)

```json
{
  "code": 401,
  "message": "Please Authenticate"
}
```

* **`code`**: Error code.
* **`message`**: Error message indicating unauthorized access.

#### Not Found (Code 404)

```json
{
  "code": 404,
  "message": "Not Found"
}
```

* **`code`**: Error code.
* **`message`**: Error message indicating that the logout request was not found.

#### MetaMask Not Found (Code 404)&#x20;

```json
{
  "code": 404,
  "message": "Nonce Not Found"
}
```

* **`code`**: Error code.
* **`message`**: Error message indicating that the nonce was not found.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://xerial.gitbook.io/xerial-doc/xerial-apis/wallet-api/errors-handling/authentication-errors.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
