MDErrorReporter/exceptions/generic/MDAccessDeniedException.php

<?PHP
declare(strict_types = 1);

/**
 * Custom exception class to throw when users attempt to access a page without necessary permissions.
 */
final class MDAccessDeniedException extends MDExpectedException {
    /**
     * Error message.
     *
     * @return string
     */
    public function errorMessage() {
        //error message
        return 'Access denied: ' . $this->getMessage();

    }
}