Help with Security Assist and Framework

Can Framework be used to include a login page into a page that has Ecart code? For example I have a product page that has add to cart buttons. I am using Framework to include my login page whenever someone wants to login from the products page. The login form pops up in a modal window. When I try to login from the products page I get the following error:

Warning: Cannot modify header information - headers already sent by (output started at E:\vhosts\webTest\store\rings.php:5) in E:\vhosts\webTest\WA_SecurityAssist\Helper_PHP.php on line 38

If I loging from the index page I get I success login. I click on the link to pop up my modal window and I get redirected to my success page.

I was looking for a solution to solve my problem and the only ones I found referred to blank lines on the Helper.php. I deleted all the blank lines and I still was not able to login from the product page.

This is what line 38 has: header("Location: ".$WA_Auth_Parameter["successRedirect"]);

By the way I am NOT using the DYNAMIC plug in framework.