Joomla User Extended Registration Problem

URGENT I have created an extended user registration form using Content Builder It seems to work but after the user enters the accounts details and he received an email confirmation to activate his account, he is redirected to an error page... i think this problem is due to permissions but I was not able to solve it. I am pretty sure an experienced joomla/contentbuilder user is able to fix it in no time. In addition I am unable to link it to the Template login form. In alternative if you are able you can create an extended user registration form without using contentbuilder. What really matters is to have an extended form with address, etc etc