Multi-store 404 error under prestashop

I am trying to create multi-store under prestashop 1.6 version, and so i followed steps that figure on the prestashop documentation.

What i have done is that I activated multi-store option on prestashop, and added a new shop to my existing shop group, and i give it an URL to like this : http://ift.tt/2322Li0 but all the time when i try to connect to my new store it displays a 404 error.

What is wrong i can not figure out the problem.