error button Checkout

-- HikaShop version -- : 4.4.3
-- Joomla version -- : Joomla! 3.9.27
-- PHP version -- : PHP Version 7.3.28
-- Browser(s) name and version -- : Firefox
-- Error-message(debug-mod must be tuned on) -- : @import url (/media/com_hikamarket/css/frontend_default.css?v=400);

Hello,
When I am in the shopping cart ready to pay, when I change my payment method (ex: check or credit card etc ...) the button to pay instead displays this:

@import url (/media/com_hikamarket/css/frontend_default.css?v=400);

Can you tell me if you have the same error?
thanks in advance

Michel D.