Hello,
To fix the error from the error logs edit the xstore/framework/theme-functions.php file and just remove that line https://prnt.sc/1v0zvs8
We’ll fix this error in the next theme update.
Did you try the mentioned plugins with the default theme? Do they work ok with the Storefront theme for example?
Provide us with the screenshot of how it works with the default theme for you. If error appears only when our theme is activated and everything works fine with the default theme then create staging site and provide us with WP Dashboard and FTP access to staging site where plugin is enabled. We’ll take a closer look.
But keep in mind that it should work ok with the Storefront theme first. Because if it does not work with the Storefront we can do nothing.
Regards