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I think /dev/ttyACM0 does not exist.

Without connecting the Arduino to the machine running ROS, /dev/ttyACM0 will not appear. Also, depending on the Arduino, it may have a different name, such as /dev/ttyUSB0.

I think /dev/ttyACM0 does not exist.

Without connecting the Arduino to the machine running ROS, /dev/ttyACM0 will not appear. Also, depending on the Arduino, it may have a different name, such as /dev/ttyUSB0.

UPDATE

I watched the tutorial. I think you're making a typo.

Did you type the semicolon incorrectly?

Port;/dev/ttyACM0 -> PORT /dev/ttyACM0