The user class have a picture attribute in one of my website.
If the attribute is filled with a picture, i can't login. The following error occurs.
"The security context contains no authentication token. One possible reason may be that there is no firewall configured for this URL."
If the attribute is not filled, there is no problem.
The error message made me think of a security.yml issue, but it works when there is no image so i don't think the message is the correct one.