I download and install megadeal ii

the first thing i did is to update joomla to the last release (3.9.25) and all the extensions except sp page builder pro after this update, when i visit the website i see the below error

.border-radius is undefined: /var/www/html/eshop/templates/shaper_megadeal_ii/less/master.less on line 13

please tell me what to do, to correct this error

Thanks!