public function missing(Closure $callback)
	{
		$this->error(function(NotFoundHttpException $e) use ($callback)
		{
			return call_user_func($callback, $e);
		});
	}
public function missing(Closure $callback)
	{
		$this->error(function(NotFoundHttpException $e) use ($callback)
		{
			return call_user_func($callback, $e);
		});
	}
public function missing ( Closure $ callback ) { $ this -> error ( function ( NotFoundHttpException $ e ) use ( $ callback ) { return call_user_func ( $ callback , $ e ) ; } ) ; }
Register a 404 error handler.

@param  Closure  $callback
@return void
Register a 404 error handler .