My b2evolution Version: 2.x

I am attempting to add a stub file into a CMS ZenCart website, but when I add this to a page, I receive duplicate header errors. Is there any way to remove the header from the stub file?

You can see an example of the error I'm getting on this test site here:

http://cornerstonewebsites.com/zencart/index.php?main_page=shippinginfo

Thank you for your help.