PHP Fatal error from theme

Hello
Here the screenshot attached.

except this every day I'm getting this email from my Web Hosting Service
wth title: WordPress Updates Digest
and the mail is down below


Updates were not installed for the following items:

1. Website "Shopistic" (https://shopistic.gr): Failed to reset cache for the instance #412: PHP Fatal error: Uncaught Error: Call to undefined function kute_boutique_preview_options() in /var/www/vhosts/shopistic.gr/httpdocs/wp-content/themes/kute-boutique/shortcode/ovic_banner/config/wpbakery.php:18
Stack trace:
#0 /var/www/vhosts/shopistic.gr/httpdocs/wp-content/plugins/ovic-addon-toolkit/includes/classes/abstract-shortcode.php(253): Wpbakery_Ovic_Banner::visual_composer_include()
#1 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php(307): Ovic_Addon_Shortcode->install_WPBakery('')
#2 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#3 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /var/www/vhosts/shopistic.gr/httpdocs/wp-content/plugins/js_composer/include/classes/core/class-vc-manager.php(219): do_action('vc_before_init')
#5 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php(307): Vc_Manager->init('')
#6 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php in /var/www/vhosts/shopistic.gr/httpdocs/wp-content/themes/kute-boutique/shortcode/ovic_banner/config/wpbakery.php on line 18
Fatal error: Uncaught Error: Call to undefined function kute_boutique_preview_options() in /var/www/vhosts/shopistic.gr/httpdocs/wp-content/themes/kute-boutique/shortcode/ovic_banner/config/wpbakery.php:18
Stack trace:
#0 /var/www/vhosts/shopistic.gr/httpdocs/wp-content/plugins/ovic-addon-toolkit/includes/classes/abstract-shortcode.php(253): Wpbakery_Ovic_Banner::visual_composer_include()
#1 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php(307): Ovic_Addon_Shortcode->install_WPBakery('')
#2 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#3 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#4 /var/www/vhosts/shopistic.gr/httpdocs/wp-content/plugins/js_composer/include/classes/core/class-vc-manager.php(219): do_action('vc_before_init')
#5 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php(307): Vc_Manager->init('')
#6 /var/www/vhosts/shopistic.gr/httpdocs/wp-includes/class-wp-hook.php in /var/www/vhosts/shopistic.gr/httpdocs/wp-content/themes/kute-boutique/shortcode/ovic_banner/config/wpbakery.php on line 18
Error: A critical error occurred at this site. Learn more about debugging WordPress. A critical error occurred at this site.


3 months before I update start using the updated version of theme,
to do this I had the default wordpress theme for a couple of days and never get this errors
When I put the theme I start getting again the erros.
The same think tells me my host provider.
Please check them.

Thank you

Okay, let my coder check then I will inform you later

My coder said that you could update the PHP to version 8.
The error occurred in your cPanel, not on the theme or backend of your site. We just develop the theme based on some default templates such as Elementor, and Woo. So we cannot intervene in your host's panel to check this.

Hope you understand this. Thank you!

Add to cart doesn't works when I use 8.1.7 or 8.0.20 PHP version
It works only with 7.4.30

Excuse me, I don't understand.
I see the Add to cart process is still working: https://prnt.sc/ikxTYQMB3xV4
Or are you using version 7.x?
So, please let it to be error then we will check again for you

It's working because I'm using the 7.4.30 PHP version
When I use one of the PHP 8 version doesen't works

So we need to check the error on your site. Now you are using the lower version of PHP so the Add to cart function still works and we cannot check anything.