How to start Hokuyo UTM-30LX-EW on a Kobuki [closed]

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Hi, all. I am trying to mount a laser (hokuyo UTM-30LX-EW) on a Kobuki (i.e. turtlebot 2). The power of laser is supplied by the Kobuki itself. This driver (urg_node) from ROS is used. The kobuki is controlled by my laptop. My laptop is being on the internet by a wireless WiFi network. However, when I input:

roscore
rosrun urg_node urg_node _ip_address:="192.168.0.10"

I get the following error:

[ERROR] [1427377404.083261181]: Error connecting to Hokuyo: Could not open network Hokuyo:
192.168.0.1:10940
could not open ethernet port.

I have searched answers.ros.org and couldn't get an efficient answer. Please tell me how to solve this problem. Thanks.