Configuration error
Your backend is empty because you haven't configured any Doctrine entity to manage.
How to fix this problem
Open your app/config/config.yml file and add the following
configuration, replacing the name of the displayed entities by
your own application entities:
{{- '' -}}
# app/config/config.yml
easy_admin:
entities:
- AppBundle\Entity\Customer
- AppBundle\Entity\Order
- AppBundle\Entity\Product
{{- '' -}}