(Product) Exception on image upload

[sargath]

This field is only working properly when doctrine fixtures was ran, with some data inside db.
On empty db and with empty schema it goes:

An exception has been thrown during the rendering of a template ("Parameter "path" for route "_imagine_sylius_gallery" must match ".+" ("" given) to generate a corresponding URL.") in SyliusWebBundle:Backend/Product:create.html.twig at line 21.