I have installed my Symfony project on another computer with the same specifications, and I receive the following error when I login with fosuserbundle:
Authe
In a deploy process usually it's an environment problem (assuming that the app works fine in a dev station). FOSUserBundle it's great but for some reason it doesn't show very well the problems behind it.
As the error message says: ".. could not be processed due to a system problem."
if cleaning the cache nor updating the schema works, I would recommend try to bypass FOSUserBundle (usually the issue is between your code/configuration and the server environment) and let your bundle with the default errorhandler and logger inform any problem.
in my case it was a driver problem. (install pdo)
to bypass it, the simplest way is to remove security to a controller_action in security.yml
access_control:
{ path: ^/SomeCRUD, role: IS_AUTHENTICATED_ANONYMOUSLY }
then, if you access it, it should be able to log the issue and you should be able to fix it.
hope it helps