Fatal Error with configurable products

Installed the Sporty theme and all extensions included with it.  Works great on everything including categories, simple products, bundle product, except for configurable products.  When trying to view a configurable product I receive the following error:  
“Fatal error: Call to a member function getSource() on a non-object in ……/app/code/core/Mage/Catalog/Model/Product.php on line 1389
What could be causing this error to only occur on configurable products?
 
 
After researching this php file, this is where the file is checking to see if the product is configurable or not:
/**
* Check if product can be configured
*
* @return bool
*/
public function canConfigure()
{
$options = $this->getOptions();
return !empty($options) || $this->getTypeInstance(true)->canConfigure($this);
}