Behat "Parent definition "sylius.behat.page.admin.crud.create" does not exist"

[Symfony\Component\DependencyInjection\Exception\RuntimeException]
  Service "app.behat.page.create_book": Parent definition "sylius.behat.page.admin.crud.create" does not exist.

If you recieve this error, try to move your app.behat.page.create_book service from services.yml to contexts.yml.

Symfony Validation not working at all

Check do you persist or flush on the FormEvents states.