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Try:

ls -l /dev/ttyACM*

maybe you have more than one device connected to your computer that uses ACM driver. If so run:

rosrun hokuyo_node hokuyo_node _port:=/dev/ttyACMx

Try:

ls -l /dev/ttyACM*

maybe you have more than one device connected to your computer that uses ACM driver. If so run:

rosrun hokuyo_node hokuyo_node _port:=/dev/ttyACMx

Edit:

By default, hokuyo_node assumes that you have connected with USB, which uses ACM. As tfoote wrote in the comment:

rosrun hokuyo_node hokuyo_node _port:=/dev/ttyUSB0

should do the trick.

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