Upgraded from 1.7.0.2 to 1.9.2.1. Now I cannot get the e-mails work. Found from exception.log following trace but I cannot find the reason what causes that. If that is featured product then I am not willing to show any featured products in e-mails.
#0 /public_html/app/code/core/Mage/Core/Model/Layout.php(495): Mage::throwException('Unknown block type...')
#1 /public_html/app/code/core/Mage/Core/Model/Layout.php(437): Mage_Core_Model_Layout->_getBlockInstance('featuredproduct...', Array)
#2 /public_html/app/code/core/Mage/Core/Model/Email/Template/Filter.php(169): Mage_Core_Model_Layout->createBlock('featuredproduct...', NULL, Array)
#3 [internal function]: Mage_Core_Model_Email_Template_Filter->blockDirective(Array)
#4 /public_html/lib/Varien/Filter/Template.php(163): call_user_func(Array, Array)
#5 /public_html/app/code/core/Mage/Core/Model/Email/Template/Filter.php(548): Varien_Filter_Template->filter('\n\t\t\n\t\t\n\t\t\t\t\n\t\t\t...')
#6 /public_html/app/code/core/Mage/Cms/Block/Page.php(101): Mage_Core_Model_Email_Template_Filter->filter('\n\t\t\n\t\t\n\t\t\t\t\n\t\t\t...')
#7 /public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Cms_Block_Page->_toHtml()
#8 /public_html/app/code/core/Mage/Core/Block/Abstract.php(637): Mage_Core_Block_Abstract->toHtml()
#9 /public_html/app/code/core/Mage/Core/Block/Abstract.php(577): Mage_Core_Block_Abstract->_getChildHtml('cms_page', true)
#10 /public_html/app/code/core/Mage/Page/Block/Html/Wrapper.php(52): Mage_Core_Block_Abstract->getChildHtml('', true, true)
#11 /public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Page_Block_Html_Wrapper->_toHtml()
#12 /public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#13 /public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Text_List->_toHtml()
#14 /public_html/app/code/core/Mage/Core/Block/Abstract.php(637): Mage_Core_Block_Abstract->toHtml()
#15 /public_html/app/code/core/Mage/Core/Block/Abstract.php(581): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#16 /public_html/app/design/frontend/default/MAGFREE001/template/page/1column.phtml(49): Mage_Core_Block_Abstract->getChildHtml('content')
#17 /public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/data02/virt339...')
#18 /public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#19 /public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#20 /public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Template->_toHtml()
#21 /public_html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#22 /public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#23 /public_html/app/code/core/Mage/Cms/Helper/Page.php(137): Mage_Core_Controller_Varien_Action->renderLayout()
#24 /public_html/app/code/core/Mage/Cms/Helper/Page.php(52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_PageController), '8')
#25 /public_html/app/code/core/Mage/Cms/controllers/PageController.php(45): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_PageController), '8')
#26 /public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_PageController->viewAction()
#27 /public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#28 /public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#29 /public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#30 /public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#31 /public_html/index.php(83): Mage::run('', 'store')
#32 {main}
