When you have a 500 bugs, you can get more info by using the symfony debug mode http://your_server/frontend_dev.php
Did your error come from creating the user? If so, it might be related to this one, the email configuration: https://bugs.launchpad.net/authpuppy/+bug/621394
Otherwise, reproduce the error in debug mode and post the detailed output.
When you have a 500 bugs, you can get more info by using the symfony debug mode http:// your_server/ frontend_ dev.php
Did your error come from creating the user? If so, it might be related to this one, the email configuration: https:/ /bugs.launchpad .net/authpuppy/ +bug/621394
Otherwise, reproduce the error in debug mode and post the detailed output.