documentation/_authentication_exception_8php_source.html

 <?php
 namespace Magento\Framework\Exception;

 class AuthenticationException extends LocalizedException
 {
     const AUTHENTICATION_ERROR = 'An authentication error occurred. Verify and try again.';
 }
Magento\Framework\Exception\LocalizedException
Definition: LocalizedException.php:17

Magento\Framework\Exception
Definition: AbstractAggregateException.php:7

Magento\Framework\Exception\AuthenticationException\AUTHENTICATION_ERROR
const AUTHENTICATION_ERROR
Definition: AuthenticationException.php:19

Magento\Framework\Exception\AuthenticationException
Definition: AuthenticationException.php:14