I filled in the info for Sales> Google API and it also said to fill the tracking code in the Head HTML in Design. After doing that I checked the website and everything is loading except when I click on a product or a category. I get this:
Fatal error: Call to a member function addToChildGroup() on null in /home/bvsecuri/public_html/app/code/core/Mage/Core/Block/Abstract.php on line 815
Please help me fix it! I do not know how this happened when yesterday the site was fine.