#Mautic How to show error message

_readme.md

1. open a plain text file, add the following lines, and save:
   Filename: custom_offline.php
2. upload the file to your mautic root.
3. if you can check out the error message, please remove custom_offline.php for your security.

custom_offline.php

<?php
defined('MAUTIC_OFFLINE') or die('access denied');

if ($e instanceof Exception) {
    echo $e->getMessage();
}