Hi whitedd,
Thanks for posting. Luckily I am already aware and a fix has already been made. An update to the next version will be pushed out either later today or tomorrow at the latest.
In the meantime, some extra info. First, that is a warning, not an error, so it’s nothing scary (but it is obviously annoying and something that needs to be looked at) and HD Quiz will continue to work as intended.
Second, that is only showing because your site is running in debug mode. This is never recommended for live/production sites as it can potentially leak important information about your server. So I recommended disabling debug mode unless this is something you need right now.
For most people, this mode can be removed by editing wp-config.php in your root WordPress installation folder and looking for the line define( 'WP_DEBUG', true );. Change true to false and it will hide those notices.
