Upgrading to PHP 7.3

After updating my PHP to 7.3 I am getting the following error. Can anyone share what I need to do? I have Theme Th7 V4 and also cannot log in to my site.

arning : Declaration of Envato_Theme_Installer_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, …$args) in /homepages/27/d391180040/htdocs/clickandbuilds/WanderingCellars/wp-content/themes/dt-the7/inc/mods/theme-update/envato-wordpress-toolkit-library/class-envato-wordpress-theme-upgrader.php on line 335

Hi, please contact the theme developer Dream-Theme ( @Dream-Theme ) or open a help ticket on their support website: https://support.dream-theme.com/?envato_item_id=5556590