Controlling object with magnetic position sensor (Ardity)

Hello. I hope you can help me. I’m new to Unity.

I am trying to control position of the object in Unity with magnetic position sensor.

I connected the sensor to Arduino and able to receive data on Unity side but the object is not moving when I change the magnetic field. I am using Ardity to connect toArduino Uno. And then I have this error when I try to run play

SendMessage OnMessageArrived has no receiver!
UnityEngine.GameObject:SendMessage (string,object)
SerialController:Update () (at Assets/Ardity/Scripts/SerialController.cs:126)

and this script is from Ardity. I don’t know what I am doing wrong.