Force Feedback: Class not registered error #43

          var ep = new EffectParameters();
          var CF = new ConstantForce();
          var joystick = new Joystick(directInput, joystickGuid);
          joystick.SetCooperativeLevel(
                FormHandle,
                CooperativeLevel.Exclusive | CooperativeLevel.Background);

            ep = new EffectParameters();
            ep.Flags = EffectFlags.Cartesian | EffectFlags.ObjectOffsets;
            ep.Directions = new int[1] { 0 };
            ep.Gain = 5000;
            ep.Duration = int.MaxValue;
            ep.SamplePeriod = joystick.Capabilities.ForceFeedbackSamplePeriod;
            CF = new ConstantForce();
            CF.Magnitude = 10000;
            ep.Parameters = CF;

            Effect e = new Effect(joystick, joystickGuid, ep);
            e.Start();