Notice: Array to string conversion  in /var/www/schatkaartprod/app/code/core/Mage/Core/Model/Layout.php on line 555

#0 /var/www/schatkaartprod/app/code/core/Mage/Core/Model/Layout.php(555): mageCoreErrorHandler(8, 'Array to string conversion', '/var/www/schatkaartprod/app/code/core/Mage/Core/Model/Layout.php', 555, Array)
#1 /var/www/schatkaartprod/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#2 /var/www/schatkaartprod/app/code/core/Mage/Cms/Helper/Page.php(137): Mage_Core_Controller_Varien_Action->renderLayout()
#3 /var/www/schatkaartprod/app/code/core/Mage/Cms/Helper/Page.php(52): Mage_Cms_Helper_Page->_renderPage(Mage_Cms_IndexController, 'home')
#4 /var/www/schatkaartprod/app/code/core/Mage/Cms/controllers/IndexController.php(45): Mage_Cms_Helper_Page->renderPage(Mage_Cms_IndexController, 'home')
#5 /var/www/schatkaartprod/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_IndexController->indexAction()
#6 /var/www/schatkaartprod/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#7 /var/www/schatkaartprod/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Mage_Core_Controller_Request_Http)
#8 /var/www/schatkaartprod/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#9 /var/www/schatkaartprod/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#10 /var/www/schatkaartprod/index.php(87): Mage->run('', 'store')