Call to undefined function fs_dynamic_init()

Hello,

After upgrading to the latest version (2.5.8 -> 2.7.7), I am getting that error:

PHP Fatal error occurred: Uncaught Error: Call to undefined function fs_dynamic_init() in /home/www/wp-content/plugins/woocommerce-shipping-gateway-per-product/woocommerce-product-shippings.php:47 

Stack trace: 
#0 /home/www/wp-content/plugins/woocommerce-shipping-gateway-per-product/woocommerce-product-shippings.php(74): dfm_sgppfw_fs() 
#1 /home/www/wp-settings.php(560): include_once('/home/...') 
#2 /home/www/wp-config.php(89): require_once('/home/...') 
#3 /home/www/wp-load.php(50): require_once('/home/...') 
#4 {main} thrown in /home/www/wp-content/plugins/woocommerce-shipping-gateway-per-product/woocommerce-product-shippings.php on line 47.