Taxonomy url system works but the alias url doesn't work for a new term added in the Collection vocabulary

I added a new term Libros in the Collection vocabulary. Then I created a product and set "libros" for the Collection field. Now if I go to:

http://localhost/commerce_kickstart/es/collection/libros (no product is shown)

but if I go to:

http://localhost/commerce_kickstart/es/taxonomy/term/80 (the product I've create is shown correctly) (80 is the id of the "libros" term)