But sometimes you can just add the cable like this, start the program, it'll work but because you've not clicked while working the cable will move. It might be possible that the port is correct but when connecting the cable you have not pushed the cable. So, what you should do now if you see this screen and this blink you just press on back to stop the program. And because there is no motor the brick detects that there is no motor cannot get some feedback from the motor and it just stops. This happens because the robot is trying to direct both motors to move forward and there is no motor on port C. But if we just move this cable not to port C but to port D and start the same program you see that the whole robot does not move. In the program we've configured the two ports for our robot to be B and C. This here is our program for moving forward but sometimes the connection between the cable and the robot might not be good enough and the program won't work.