crashes site when checking transactions pending

hi guys
on my drupal 7 clean install with ecommerce, when the user purchases a product they get an error on the page (error below) but then it also says your order has been submitted,
in the admin, when i go to check the pending transactions i get an internal 500 error

the error upon purchasing is

Warning: Parameter 1 to ec_store_condition_gross() expected to be a reference, value given in FacesExtendable->__call() (line 123 of /var/www/vhosts/mysite/temp/sites/all/modules/rules/includes/faces.inc).
Warning: Parameter 1 to ec_store_condition_allocation_status_changed() expected to be a reference, value given in FacesExtendable->__call() (line 123 of /var/www/vhosts/mysite/temp/sites/all/modules/rules/includes/faces.inc).
Warning: Parameter 1 to ec_store_condition_is_shippable() expected to be a reference, value given in FacesExtendable->__call() (line 123 of /var/www/vhosts/mysite/temp/sites/all/modules/rules/includes/faces.inc).
Warning: Parameter 1 to ec_store_condition_allocation_status_changed() expected to be a reference, value given in FacesExtendable->__call() (line 123 of /var/www/vhosts/mysite/temp/sites/all/modules/rules/includes/faces.inc).
Warning: Parameter 1 to ec_store_condition_is_shippable() expected to be a reference, value given in FacesExtendable->__call() (line 123 of /var/www/vhosts/mysite/temp/sites/all/modules/rules/includes/faces.inc).

i appreciate any help thank u so much