There has been an error processing your request

The attribute model is not defined
Trace: #0 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(239): Mage::throwException('The attribute m...') #1 /chroot/home/jrdunnco/jrdunn.com/html/app/code/local/JRDunn/ImprovedNavigation/Block/Top.php(128): Mage_Catalog_Model_Layer_Filter_Abstract->getAttributeModel() #2 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Block/Abstract.php(297): JRDunn_ImprovedNavigation_Block_Top->_prepareLayout() #3 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Model/Layout.php(484): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout)) #4 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Model/Layout.php(500): Mage_Core_Model_Layout->createBlock('amshopby/top', 'amshopby.top') #5 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Model/Layout.php(247): Mage_Core_Model_Layout->addBlock('amshopby/top', 'amshopby.top') #6 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Model/Layout.php(213): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element)) #7 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Model/Layout.php(218): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element)) #8 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks() #9 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Catalog/controllers/CategoryController.php(148): Mage_Core_Controller_Varien_Action->generateLayoutBlocks() #10 /chroot/home/jrdunnco/jrdunn.com/html/app/code/local/Amasty/Shopby/controllers/CategoryController.php(49): Mage_Catalog_CategoryController->viewAction() #11 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Amasty_Shopby_CategoryController->viewAction() #12 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view') #13 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http)) #14 /chroot/home/jrdunnco/jrdunn.com/html/app/code/core/Mage/Core/Model/App.php(381): Mage_Core_Controller_Varien_Front->dispatch() #15 /chroot/home/jrdunnco/jrdunn.com/html/app/Mage.php(694): Mage_Core_Model_App->run(Array) #16 /chroot/home/jrdunnco/jrdunn.com/html/index.php(83): Mage::run('', 'store') #17 {main}

Error log record number: 840408539781