Propel has to be configured...
new Propel\PropelBundle\PropelBundle(),

new EmilioMg\Propel\ProviderBehaviorBundle\EmilioMgPropelProviderBehaviorBundle(),

php app/console propel:model:build
php app/console cache:clear
php app/console container:debug | grep provider

emilio_mg_propel_provider_behavior:
    auto_generate_services: true
    prefix: ''
    suffix: ''