jos-Error: Unable to load renderer class

JSite -> dispatch() @ /home/wilmoy1/backbonecampaign.org/index.php:42
JComponentHelper :: renderComponent() @ /home/wilmoy1/backbonecampaign.org/includes/application.php:197
JComponentHelper :: executeComponent() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/application/component/helper.php:351
require_once() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/application/component/helper.php:383
JController -> execute() @ /home/wilmoy1/backbonecampaign.org/components/com_k2/k2.php:62
K2ControllerItemlist -> display() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/application/component/controller.php:761
K2Controller -> display() @ /home/wilmoy1/backbonecampaign.org/components/com_k2/controllers/itemlist.php:49
JController -> display() @ /home/wilmoy1/backbonecampaign.org/components/com_k2/controllers/controller.php:32
K2ViewItemlist -> display() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/application/component/controller.php:722
K2ModelItemlist -> getModuleItems() @ /home/wilmoy1/backbonecampaign.org/components/com_k2/views/itemlist/view.feed.php:31
JError :: raiseError() @ /home/wilmoy1/backbonecampaign.org/components/com_k2/models/itemlist.php:1143
JError :: raise() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/error/error.php:251
JError :: throwError() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/error/error.php:176
call_user_func_array() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/error/error.php:214
JError :: handleCallback()
call_user_func() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/error/error.php:765
plgSystemRedirect :: handleError()
JError :: customErrorPage() @ /home/wilmoy1/backbonecampaign.org/plugins/system/redirect/redirect.php:104
JDocumentError -> render() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/error/error.php:804
JDocumentError -> _loadTemplate() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/document/error/error.php:107
require_once() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/document/error/error.php:135
Gantry -> displayModules() @ /home/wilmoy1/backbonecampaign.org/templates/rt_corvus/error.php:47
GantryModulesRenderer :: display() @ /home/wilmoy1/backbonecampaign.org/libraries/gantry/core/gantry.class.php:867
GantryFeatureDropdownMenu -> render() @ /home/wilmoy1/backbonecampaign.org/libraries/gantry/core/renderers/gantrymodulesrenderer.class.php:65
JDocument -> loadRenderer() @ /home/wilmoy1/backbonecampaign.org/templates/rt_corvus/features/dropdownmenu.php:44
JError :: raiseError() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/document/document.php:926
JError :: raise() @ /home/wilmoy1/backbonecampaign.org/libraries/joomla/error/error.php:251