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

#0 /var/www/tanzanitas/app/code/core/Mage/Core/Model/Layout.php(555): mageCoreErrorHandler(8, 'Array to string...', '/var/www/tanzan...', 555, Array)
#1 /var/www/tanzanitas/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#2 /var/www/tanzanitas/app/code/core/Mage/Catalog/controllers/CategoryController.php(161): Mage_Core_Controller_Varien_Action->renderLayout()
#3 /var/www/tanzanitas/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Catalog_CategoryController->viewAction()
#4 /var/www/tanzanitas/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#5 /var/www/tanzanitas/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#6 /var/www/tanzanitas/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#7 /var/www/tanzanitas/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#8 /var/www/tanzanitas/index.php(90): Mage::run('', 'store')
#9 {main}