registration as check out not possible

-- HikaShop version -- : 5.0.2 [2311290552]
-- Joomla version -- : 5.0.1
-- PHP version -- : 8.2
-- Browser(s) name and version -- : Chrome 120.0.6099.129
-- Error-message(debug-mod must be tuned on) -- : CALL TO UNDEFINED METHOD JOOMLA\CMS\APPLICATION\SITEAPPLICATION::ISADMIN()

unpossible to make new registration for new users as checkout

Hi,

This error indicates that you have an old version of the ReCaptcha plugin, which isn't compatible with Joomla 5. Download the latest version on our website and install it on yours and you won't get the error anymore:
www.hikashop.com/marketplace/product/223...-with-recaptcha.html