Error Codes

I am trying to log into my WordPress account but when I go to the login page I get these two codes

Warning: file_get_contents(/home/customer/www/seoinjector.me/public_html/wp-content/plugins/admin-site-enhancements/admin-site-enhancements.php): failed to open stream: No such file or directory in /home/customer/www/seoinjector.me/public_html/wp-includes/functions.php on line 6805

Warning: Cannot modify header information – headers already sent by (output started at /home/customer/www/seoinjector.me/public_html/wp-includes/functions.php:6805) in /home/customer/www/seoinjector.me/public_html/wp-includes/pluggable.php on line 1435

I went to my file manager and have found the lines of code where the issues are but I’m not quite exactly sure on what to do next.

The page I need help with: [log in to see the link]