Controlling speed of dc motor using ev3dev2 library

I am trying to use ev3dev2 library on python to control the speed of DC motor using GUI. but every time it gives me the same error ( dcmotor is not connected) despite the fact that it is connected. I would like to add that there is l290n driver that was connected from the beginning to control the motion and speed of motor before starting using GUI, Is the problem with this driver? I mean the dc motor cannot be seen because the l290n driver is the only thing that can be seen?

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