Warning: require_once(admin.php): failed to open stream: No such file or directory in /home/arbu/public_html/wp-admin/index.php on line 3

Fatal error: require_once(): Failed opening required 'admin.php' (include_path='.:/opt/cpanel/ea-php71/root/usr/share/pear') in /home/arbu/public_html/wp-admin/index.php on line 3