question about your Forum and Membership

Hello, I have a question about your forum. I am developing a system that uses the Membership to track users. I also have a customized profile. I wish that when a user is logged on my site he would not have to login to forum again, that is, to pass the login information between the two sites. I converted  the forum in a web application and made it to override my web application. I deleted the information from the web.config membership of the forum, but when I go to the forum he returns the following error:

[NullReferenceException: Object reference not set to an instance of an object.]    ASPPG.BaseClasses.CommonPageBaseClass.GetPageTheme(CurrentUser memberInfo) +579 
  
 what I did wrong? 
  
 

Hi,
 
I suggest that you follow the description to set up the forum to integrate with your membership provider, as well as Single Sign On (Scenario 1 in the following article):
 
http://www.aspplayground....base-m397994.aspx#sce1