eCommerce Error

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Hi All

I have this one little issue with the eCommerce package. It is working so far but I cannot edit the page name of the main page of the Cart.

When I select properties in the Sitemap to change it, I get this error
"Fatal error: Call to a member function getUserName() on a non-object in /home/content/68/7400968/html/invenuities/concrete/helpers/form/user_selector.php on line 46".

Before I go in looking to change a core file, I was wondering if anyone has seen this error and if so, how did they fix it.

Thanks in advance
Bill

bcarone