WARNING(2): "session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/web710/html/shop/index.php:3)"

WARNING(2): "session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/web710/html/shop/index.php:3)"

WARNING(2): "session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/web710/html/shop/index.php:3)"

WARNING(2): "session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/web710/html/shop/index.php:3)"

WARNING(2): "session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/web710/html/shop/index.php:3)"

WARNING(2): "session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/web710/html/shop/index.php:3)"

WARNING(2): "include_once(/var/www/web710/html/shop/system/classes/shopping_cart/CartActionsProcess.inc.php): failed to open stream: No such file or directory"

WARNING(2): "include_once(): Failed opening '/var/www/web710/html/shop/system/classes/shopping_cart/CartActionsProcess.inc.php' for inclusion (include_path='.:/opt/php/7.1.33/share/pear')"

WARNING(2): "include_once(/var/www/web710/html/shop/system/classes/shopping_cart/CartActionsProcess.inc.php): failed to open stream: No such file or directory"

WARNING(2): "include_once(): Failed opening '/var/www/web710/html/shop/system/classes/shopping_cart/CartActionsProcess.inc.php' for inclusion (include_path='.:/opt/php/7.1.33/share/pear')"

FATAL ERROR(1): "Uncaught Error: Class 'CartActionsProcess' not found in /var/www/web710/html/shop/system/core/MainFactory.inc.php(517) : eval()'d code:1
Stack trace:
#0 /var/www/web710/html/shop/system/core/MainFactory.inc.php(517): eval()
#1 /var/www/web710/html/shop/includes/cart_actions.php(34): MainFactory::create_object('CartActionsProc...')
#2 /var/www/web710/html/shop/includes/application_top.php(1156): require('/var/www/web710...')
#3 /var/www/web710/html/shop/index.php(30): include('/var/www/web710...')
#4 {main}
  thrown"