Fatal error: Uncaught Error: Call to undefined function WC() in /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-content/plugins/woocommerce-checkout-field-editor-pro/includes/class-thwcfe.php:78 Stack trace: #0 /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-content/plugins/woocommerce-checkout-field-editor-pro/includes/class-thwcfe.php(72): THWCFE->define_constants() #1 /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-includes/class-wp-hook.php(341): THWCFE->init('') #2 /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #3 /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #4 /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-settings.php(742): do_action('init') #5 /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-config.php(105 in /home/klient.dhosting.pl/jakubkob99/nowa.jakubkobylinski.pl/public_html/wp-content/plugins/woocommerce-checkout-field-editor-pro/includes/class-thwcfe.php on line 78