Error when creating new controller in back office

[thilip.xandy]

When I creating module controller for backoffice I'm Getting the error check my code and error 

 

FYI : I Have created a menu in backoffice with the following details. 

 

Name : Marker Place

class :MarketPlace 

module : marketPlace

 

this my module controller code 

 

class MarketPlaceController extends ModuleAdminController

{

 

          public function __construct()

          {

                 parent::__construct();

          }

 

           public function initContent()

          {

                 parent::initContent();

                 $this->setTemplate('list.tpl');

           }

 

}

 

 

 

 

Fatal error: Call to undefined method marketPlace::viewAccess() in G:\xampp\htdocs\project1\admin4638\functions.php on line 273