I'm trying to make a custom 404 page using Custom 404 Page v1.1 by Amiya Sahu.
I modified this plugin to maintenance mode, and work for 'maintenance mode', but no 'not-found'
I need to know where is this --> A Question2Answer database query failed when generating this page.
A full description of the failure is available in the web server's error log file.
see the picture
That depends on your web server configuration. In my case, using Apache on Debian 8 with a default configuration, the path to the file is this: /var/log/apache2/error.log
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