Method "controller_action_layout_generate_blocks_after" is not defined in "VES_Core_Model_Observer"

#0 /home/mtm/www/public_html/app/code/core/Mage/Core/Model/App.php(1341): Mage::throwException('Method "control...')
#1 /home/mtm/www/public_html/app/code/core/Mage/Core/Model/App.php(1318): Mage_Core_Model_App->_callObserverMethod(Object(VES_Core_Model_Observer), 'controller_acti...', Object(Varien_Event_Observer))
#2 /home/mtm/www/public_html/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#3 /home/mtm/www/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(351): Mage::dispatchEvent('controller_acti...', Array)
#4 /home/mtm/www/public_html/app/code/local/Smartwave/Ajaxcatalog/controllers/Catalog/CategoryController.php(107): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#5 /home/mtm/www/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Smartwave_Ajaxcatalog_Catalog_CategoryController->viewAction()
#6 /home/mtm/www/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#7 /home/mtm/www/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))
#8 /home/mtm/www/public_html/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#9 /home/mtm/www/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#10 /home/mtm/www/public_html/index.php(133): Mage::run('es', 'store')
#11 {main}