I can't restore backup from a snapshot

When I try to restore a backup from managed backups it gets stuck at 40%. After I re-install WP 4.9 it stuck at 80%.
After adding debug code to wp-config file I see still the same error:
PHP Fatal error: Cannot redeclare wp_ajax_press_this_save_post() (previously declared in /home/******/public_html/wp-includes/deprecated.php:3921) in /home/******/public_html/wp-admin/includes/ajax-actions.php on line 3197

Can you help me?
Thank you