Incompability of Ultimate Facebook with wocommerce

I have installed woocommerce and whith ultimate facebook when a new user registers i have this error in the top of the theme.

Warning: Missing argument 2 for woocommerce_load_persistent_cart() in /home/mysitewe/public_html/pruebas/prueba2/wp-content/plugins/woocommerce/woocommerce-core-functions.php on line 215

After the registration, the login works fine.

It seems an incompatibility, any ideas?