Empty confirmation mail with FOSUSER BUNDLE

Question

I'm beginner in Symfony2, I follow symfony documentation: FOSUserBundle Emails for Registration and Confirmation, but I receive an empty mail.

I can create a new user and login, but the email confirmation is empty

Answer 1

the problem is in : " php app/console cache:clear --env=prod " so i delete the the contents of folder Cache to clean the cache.

Answer 2

fos_user:
    registration:
         confirmation:
             enabled:    true

place it in your:: app/config/config.yml