I have installed a module for credit card payment in prestashop 1.5.2 but when I click on it to pay with credit card I get this error:
Fatal error: Cannot redeclare class gestpay in /var/www/vhosts/[login to view URL] on line 561
This could be a compatibility error, but I have another site with same server configuration, same prestashop and module versions that works well.
I would need the module totally working asap.