Hello Maria,
The “Latest” theme is fully child theme compatible, and is fully compatible with the Child Theme Configurator plugin. I just tested it to be sure and all is OK.
The error message tells us that it is a plugin called “Ultimate Social Media Icons” that is causing the error on your site.
(Notice: Undefined index: title in /var/www/volumes/xvdg1/vhosts/pamperpillar.com/httpdocs/wp-content/plugins/ultimate-social-media-icons/libs/sfsi_widget.php on line 29)
It is wrong for the Child Theme Configurator plugin to say that the theme generated the PHP error.
You would need to disable the “Ultimate Social Media Icons” plugin while you are creating your child theme, or if you really need to keep that plugin active, you should contact the authors of the social media icons plugin to find out why it is giving you the PHP debug notice.
Hope this information helps.