Omeka has encountered an error

Omeka_Controller_Exception_404

Omeka_Controller_Action_Helper_Db: No ID passed to this request

exception 'Omeka_Controller_Exception_404' with message 'Omeka_Controller_Action_Helper_Db: No ID passed to this request' in /usr/local/data/htdocs/omeka/application/controllers/helpers/Db.php:118
Stack trace:
#0 /usr/local/data/htdocs/omeka/application/libraries/Omeka/Controller/AbstractActionController.php(154): Omeka_Controller_Action_Helper_Db->findById()
#1 /usr/local/data/htdocs/omeka/application/libraries/Zend/Controller/Action.php(516): Omeka_Controller_AbstractActionController->showAction()
#2 /usr/local/data/htdocs/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('showAction')
#3 /usr/local/data/htdocs/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#4 /usr/local/data/htdocs/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#5 /usr/local/data/htdocs/omeka/application/libraries/Zend/Application.php(382): Zend_Application_Bootstrap_Bootstrap->run()
#6 /usr/local/data/htdocs/omeka/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#7 /usr/local/data/htdocs/omeka/index.php(23): Omeka_Application->run()
#8 {main}