Could not load type phpcr_document symfonyCMF+Symfony3.2+SonataBundle

  doctrine-phpcr, document, symfony, symfony-cmf

i have installed the symfony CMF bundle into and existing symfony 3.2 project with sonata.
I have followed the configuration to create a PostAdmin file to be able to create and list the entity ( in the sonata backend page.
But i have the error on Could not load type phpcr_document.
It is been more than 02 weeks, i don’t know how to proceed. i can list elements, but the creation is not going through

Source: Symfony Questions