Small Graduation Yard Sign

Fatal error: Uncaught Error: Call to a member function unsetChild() on boolean in /var/www/html/app/design/frontend/shopper/default/template/catalog/product/view.phtml:211 Stack trace: #0 /var/www/html/app/code/core/Mage/Core/Block/Template.php(241): include() #1 /var/www/html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/shoppe...') #2 /var/www/html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView() #3 /var/www/html/app/code/core/Mage/Review/Block/Product/View.php(47): Mage_Core_Block_Template->_toHtml() #4 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Review_Block_Product_View->_toHtml() #5 /var/www/html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml() #6 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml() #7 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml() #8 /var/www/html/app/code/c in /var/www/html/app/design/frontend/shopper/default/template/catalog/product/view.phtml on line 211