The attribute model is not defined

#0 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(239): Mage::throwException('The attribute m...')
#1 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/community/Mana/Filters/Model/Filter/Attribute.php(114): Mage_Catalog_Model_Layer_Filter_Abstract->getAttributeModel()
#2 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/community/Mana/Filters/Model/Filter/Attribute.php(78): Mana_Filters_Model_Filter_Attribute->_getItemsData()
#3 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(120): Mana_Filters_Model_Filter_Attribute->_initItems()
#4 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(109): Mage_Catalog_Model_Layer_Filter_Abstract->getItems()
#5 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(126): Mage_Catalog_Model_Layer_Filter_Abstract->getItemsCount()
#6 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/design/frontend/katydidcollection/default/template/catalog/layer/view.phtml(46): Mage_Catalog_Block_Layer_Filter_Abstract->getItemsCount()
#7 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Template.php(241): include('/home/sfbc/doma...')
#8 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/katydi...')
#9 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#10 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Abstract.php(803): Mage_Core_Block_Template->_toHtml()
#11 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#12 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Abstract.php(803): Mage_Core_Block_Text_List->_toHtml()
#13 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Abstract.php(570): Mage_Core_Block_Abstract->toHtml()
#14 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Abstract.php(514): Mage_Core_Block_Abstract->_getChildHtml('left', true)
#15 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/design/frontend/enterprise/default/template/page/2columns-left.phtml(49): Mage_Core_Block_Abstract->getChildHtml('left')
#16 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Template.php(241): include('/home/sfbc/doma...')
#17 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/enterp...')
#18 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#19 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Block/Abstract.php(803): Mage_Core_Block_Template->_toHtml()
#20 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Model/Layout.php(529): Mage_Core_Block_Abstract->toHtml()
#21 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Controller/Varien/Action.php(391): Mage_Core_Model_Layout->getOutput()
#22 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Catalog/controllers/CategoryController.php(159): Mage_Core_Controller_Varien_Action->renderLayout()
#23 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Controller/Varien/Action.php(420): Mage_Catalog_CategoryController->viewAction()
#24 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('view')
#25 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#26 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/code/core/Mage/Core/Model/App.php(347): Mage_Core_Controller_Varien_Front->dispatch()
#27 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/app/Mage.php(640): Mage_Core_Model_App->run(Array)
#28 /home/sfbc/domains/prod.shopforbags.com/public_html/releases/1.1.0.1/index.php(84): Mage::run('katydidcollecti...', 'website')
#29 {main}