Warning: require(./wp-blog-header.php): failed to open stream: No such file or directory in /srv/users/isoftanzau/apps/isoftanzau/public/index.php on line 15

Fatal error: require(): Failed opening required './wp-blog-header.php' (include_path='.:/opt/sp/php7.4/lib/php') in /srv/users/isoftanzau/apps/isoftanzau/public/index.php on line 15