I have changed the article class image attribute to be an image instead of an object relation, so I created one article using the admin interface, and I have set the image variation 'small' in ezpublish_dev.yml, but when I try to render the field in the frontend, using ezp5, I get one error:

An exception has been thrown during the rendering of a template ("Invalid variation 'small' for image") in TuteiBaseBundle:content/article:line.html.twig at line 5.

Please note that if I create the article using the php api, I don't have this problem. Does anyone have the same problem?