Fatal error: Uncaught Error: Undefined constant "WC_VERSION" in /var/www/vhosts/laesquina.es/httpdocs/wp-content/plugins/woocommerce-pay-for-payment/inc/class-pay4pay.php:40 Stack trace: #0 /var/www/vhosts/laesquina.es/httpdocs/wp-content/plugins/woocommerce-pay-for-payment/inc/class-pay4pay.php(16): Pay4Pay->__construct() #1 /var/www/vhosts/laesquina.es/httpdocs/wp-content/plugins/woocommerce-pay-for-payment/woocommerce-payforpayment.php(32): Pay4Pay::instance() #2 /var/www/vhosts/laesquina.es/httpdocs/wp-includes/class-wp-hook.php(324): pay4payment_plugin_init() #3 /var/www/vhosts/laesquina.es/httpdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #4 /var/www/vhosts/laesquina.es/httpdocs/wp-includes/plugin.php(517): WP_Hook->do_action() #5 /var/www/vhosts/laesquina.es/httpdocs/wp-settings.php(578): do_action() #6 /var/www/vhosts/laesquina.es/httpdocs/wp-config.php(55): require_once('...') #7 /var/www/vhosts/laesquina.es/httpdocs/wp-load.php(50): require_once('...') #8 /var/www/vhosts/laesquina.es/httpdocs/wp-blog-header.php(13): require_once('...') #9 /var/www/vhosts/laesquina.es/httpdocs/index.php(17): require('...') #10 {main} thrown in /var/www/vhosts/laesquina.es/httpdocs/wp-content/plugins/woocommerce-pay-for-payment/inc/class-pay4pay.php on line 40