PHP errors on product page dashboard from travel booking plugin

Hi, just updated to latest version of theme (v1.6.7) and travel booking plugin (v2.0.13) but having issues on the product page in dashboard, with PHP errors turned on there are errors showing just by going to the product page which are:

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-includes/functions.php on line 6362

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-admin/admin-header.php on line 9

After making a search in the top right product search area the screen goes white and shows other errors:

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-includes/functions.php on line 6362

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-includes/pluggable.php on line 1329

Warning: Cannot modify header information – headers already sent by (output started at /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-content/plugins/travel-booking/inc/product-type-tour.php:40) in /home/virtual/vps-99fa45/7/7375b79ca8/public_html/wp-includes/pluggable.php on line 1332