Invalid block type: Codex_Checkout_Block_Header

#0 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(494): Mage::throwException('Invalid block t...')
#1 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(437): Mage_Core_Model_Layout->_getBlockInstance('Codex_Checkout_...', Array)
#2 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(471): Mage_Core_Model_Layout->createBlock('codex_checkout/...', 'header.nav.menu...')
#3 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('codex_checkout/...', 'header.nav.menu...')
#4 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/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))
#5 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(206): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#6 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(206): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#7 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(206): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#8 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(206): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#9 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/Layout.php(210): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#10 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#11 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend/local/Base/app/code/local/Codex/Base/Controller/Base.php(94): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#12 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend/local/Customer/app/code/local/Codex/Customer/controllers/AccountController.php(88): Codex_Base_Controller_Base->loadLayout()
#13 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Codex_Customer_AccountController->loginAction()
#14 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('login')
#15 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#16 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/code/core/Mage/Core/Model/App.php(333): Mage_Core_Controller_Varien_Front->dispatch()
#17 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/app/Mage.php(687): Mage_Core_Model_App->run(Array)
#18 /var/www/html/frontend-floraprima/feature-t51120-neuer-checkout/vendor/floraprima/frontend-core/index.php(88): Mage::run('de', 'store')
#19 {main}