errors after 17-19 upgrade

Warning: Failed opening 'PRILL_PATHprill_common.php' for inclusion (include_path='.:/usr/local/include/php') in /var/local/vdomains/usfree.net/www/login.php on line 48
Warning: Cannot add header information - headers already sent by (output started at /var/local/vdomains/usfree.net/www/login.php:48) in /var/local/vdomains/usfree.net/www/includes/sessions.php on line 268
Warning: Cannot add header information - headers already sent by (output started at /var/local/vdomains/usfree.net/www/login.php:48) in /var/local/vdomains/usfree.net/www/includes/sessions.php on line 269
Warning: Cannot add header information - headers already sent by (output started at /var/local/vdomains/usfree.net/www/login.php:48) in /var/local/vdomains/usfree.net/www/includes/functions.php on line 1734
This is happening at logon after adding the modded files package
<img>
Steven
Warning: Cannot add header information - headers already sent by (output started at /var/local/vdomains/usfree.net/www/login.php:48) in /var/local/vdomains/usfree.net/www/includes/sessions.php on line 268
Warning: Cannot add header information - headers already sent by (output started at /var/local/vdomains/usfree.net/www/login.php:48) in /var/local/vdomains/usfree.net/www/includes/sessions.php on line 269
Warning: Cannot add header information - headers already sent by (output started at /var/local/vdomains/usfree.net/www/login.php:48) in /var/local/vdomains/usfree.net/www/includes/functions.php on line 1734
This is happening at logon after adding the modded files package
<img>
Steven