Method "addButtons" is not defined in "Konduto_Score_Model_Observer"

#0 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Model/App.php(1360): Mage::throwException('Method "addButt...')
#1 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Model/App.php(1331): Mage_Core_Model_App->_callObserverMethod(Object(Konduto_Score_Model_Observer), 'addButtons', Object(Varien_Event_Observer))
#2 /home/carone/www.carone.com.br/public/app/Mage.php(456): Mage_Core_Model_App->dispatchEvent('core_block_abst...', Array)
#3 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Block/Abstract.php(296): Mage::dispatchEvent('core_block_abst...', Array)
#4 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#5 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('core/template', 'formkey')
#6 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('core/template', 'formkey')
#7 /home/carone/www.carone.com.br/public/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 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#9 /home/carone/www.carone.com.br/public/app/code/core/Mage/Cms/Helper/Page.php(113): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#10 /home/carone/www.carone.com.br/public/app/code/core/Mage/Cms/Helper/Page.php(52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_IndexController), 'no-route')
#11 /home/carone/www.carone.com.br/public/app/code/core/Mage/Cms/controllers/IndexController.php(75): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_IndexController), 'no-route')
#12 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_IndexController->noRouteAction()
#13 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('noRoute')
#14 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#15 /home/carone/www.carone.com.br/public/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#16 /home/carone/www.carone.com.br/public/app/Mage.php(691): Mage_Core_Model_App->run(Array)
#17 /home/carone/www.carone.com.br/public/index.php(83): Mage::run('default', 'store')
#18 {main}