nl.bettermarks.com error log

error.log

8 /home/wp/disk/wordpress/wp-content/them" while reading response header from upstream, client: 162.158.91.201, server: nl.bettermarks.com, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/wordpress.php-fpm.sock:", host: "nl.bettermarks.com"
#7 /home/wp/disk/wordpress/wp-includes/general-template.php(3042): do_action('wp_head')
#6 /home/wp/disk/wordpress/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#4 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(307): wp_enqueue_scripts('')
#3 /home/wp/disk/wordpress/wp-includes/script-loader.php(2105): do_action('wp_enqueue_scri...')
#2 /home/wp/disk/wordpress/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#1 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#0 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(307): THWCFD_Public_Checkout->enqueue_styles_and_scripts('')
Stack trace:
2022/03/11 13:22:19 [error] 3746#3746: *1970204 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined function is_checkout() in /home/wp/disk/wordpress/wp-content/plugins/woo-checkout-field-editor-pro/public/class-thwcfd-public-checkout.php:22
#8 /home/wp/disk/wordpress/wp-content/them" while reading response header from upstream, client: 162.158.91.201, server: nl.bettermarks.com, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/wordpress.php-fpm.sock:", host: "nl.bettermarks.com", referrer: "https://nl.bettermarks.com/"
#7 /home/wp/disk/wordpress/wp-includes/general-template.php(3042): do_action('wp_head')
#6 /home/wp/disk/wordpress/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#4 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(307): wp_enqueue_scripts('')
#3 /home/wp/disk/wordpress/wp-includes/script-loader.php(2105): do_action('wp_enqueue_scri...')
#2 /home/wp/disk/wordpress/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#1 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#0 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(307): THWCFD_Public_Checkout->enqueue_styles_and_scripts('')
Stack trace:
2022/03/11 13:22:19 [error] 3750#3750: *1970202 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined function is_checkout() in /home/wp/disk/wordpress/wp-content/plugins/woo-checkout-field-editor-pro/public/class-thwcfd-public-checkout.php:22
#8 /home/wp/disk/wordpress/wp-content/them" while reading response header from upstream, client: 162.158.91.201, server: nl.bettermarks.com, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/wordpress.php-fpm.sock:", host: "nl.bettermarks.com", referrer: "https://dashboard.raidboxes.de/"
#7 /home/wp/disk/wordpress/wp-includes/general-template.php(3042): do_action('wp_head')
#6 /home/wp/disk/wordpress/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#4 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(307): wp_enqueue_scripts('')
#3 /home/wp/disk/wordpress/wp-includes/script-loader.php(2105): do_action('wp_enqueue_scri...')
#2 /home/wp/disk/wordpress/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#1 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#0 /home/wp/disk/wordpress/wp-includes/class-wp-hook.php(307): THWCFD_Public_Checkout->enqueue_styles_and_scripts('')
Stack trace:
2022/03/11 13:22:18 [error] 3746#3746: *1970200 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined function is_checkout() in /home/wp/disk/wordpress/wp-content/plugins/woo-checkout-field-editor-pro/public/class-thwcfd-public-checkout.php:22