Hello!
Based on the PHP errors that you have provided, it seems that the PHP scripts are caused by incorrect access of the parameters in the theme’s script.
This is particularly noted by the first error where the Parabola script in theme-setup.php is trying to access a null parameter.
Did you switch to newer PHP recently for your site? As older PHP are more tolerant on PHP warnings however it seems that this has not been the case from PHP 7.4 onwards.
