Theme-updater Error – Site Crashing

https://<wbr />livingskywildliferehabilitatio<wbr />n.org/birdtours/ Site keeps crashing from making a post, and this error comes up. Can you suggest what might fix this?   Deprecated: Creation of dynamic property EDD_Theme_Updater_Admin::$item_name is deprecated in /home/livingskywildlif/public_html/wp-content/themes/devotepress-pro/inc/updater/theme-updater-admin.php on line 56 Deprecated: Creation of dynamic property EDD_Theme_Updater_Admin::$beta is deprecated in /home/livingskywildlif/public_html/wp-content/themes/devotepress-pro/inc/updater/theme-updater-admin.php on line 62