Hi,
The most likely problem is that you have a session_start() in your script. CMS Builder will have already started a session, so you can safely remove this.
I would also check that you don't have any lines at the top of the page before you call the CMS Builder viewer functions, the opening PHP tag that contains them should be the first thing in the file, otherwise CMS Builder cannot set the headers it needs for the page.
If neither of these work would it be possible to attach/include your code into a post for me? What error do you get on line 458?
Thanks!
Greg
Greg Thomas
PHP Programmer - interactivetools.com