Method "orderViewAfter" is not defined in ""

#0 /var/www/html/app/code/core/Mage/Core/Model/App.php(1341): Mage::throwException('Method "orderVi...')
#1 /var/www/html/app/code/core/Mage/Core/Model/App.php(1312): Mage_Core_Model_App->_callObserverMethod(false, 'orderViewAfter', Object(Varien_Event_Observer))
#2 /var/www/html/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('core_block_abst...', Array)
#3 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(298): Mage::dispatchEvent('core_block_abst...', Array)
#4 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#5 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('core/template', 'formkey')
#6 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('core/template', 'formkey')
#7 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#8 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#9 /var/www/html/app/code/core/Mage/Catalog/controllers/CategoryController.php(148): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#10 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Catalog_CategoryController->viewAction()
#11 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#12 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#13 /var/www/html/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#14 /var/www/html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#15 /var/www/html/index.php(93): Mage::run('', 'store')
#16 {main}