Why is LiipImagineBundle Symfony2 production env not working?

Question

symfony

LiipImagineBundle doesn't work in production .
Settings:
config.yml

liip_imagine:
    resolvers:
       default:
          web_path: ~

    filter_sets:
        cache: ~
        thumb:
            quality: 80
            filters:
                thumbnail: { size: [150, 150], mode: outbound }

routing.yml

_imagine:
    resource: "@LiipImagineBundle/Resources/config/routing.xml"

Call:
{{ vich_uploader_asset(gallery, 'photoFile')|imagine_filter('prev_on_page_item_slider_grid_2') }}
Everything works fine in the dev environment. In a pro environment, it refuses to work.
Googling found solutions to set the correct permissions for the cache directory and update the bundle itself. Did not help ( .

Answer 1

In general, the standard advice, if something does not work in the prod environment, is to clear the cache of the prod environment.