exception: Entity [Blog] has not been defined in the configuration

/usr/share/php/outlet/OutletConfig.php:126

1. OutletConfig->getEntity( 'Blog' )
   /usr/share/php/outlet/Outlet.php:144
2. Outlet->select( 'Blog', NULL, array )
   /home/bai/elation/include/ormmanager_class.php:69
3. OrmManager->Select( 'Blog', NULL, array )
   /home/bai/elation/include/ormmanager_class.php:71
4. OrmManager->Select( 'Blog' )
   /usr/share/elation/components/demo/components/blog/demo_blog.php:9
5. Component_demo_blog->controller_blog( array, NULL )
   :
6. call_user_func( array, array, NULL )
   /home/bai/elation/include/component_class.php:105
7. Component->HandlePayload( array, NULL )
   /home/bai/elation/include/componentmanager_class.php:151
8. ComponentManager->Dispatch( '/demo/blog', array, NULL )
   /home/bai/elation/include/app_class.php:149
9. App->Display( )
   /home/bai/elation-supercritical/htdocs/index.php:28