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[rosrun] Couldn't find executable named serial_node.py below /opt/ros/kinetic/share/rosserial_python

When I tried to execute this, I got following error:

glv@VaraPrasad:~/catkin_ws$ rosrun rosserial_
rosserial_arduino  rosserial_client   rosserial_msgs     rosserial_python
glv@VaraPrasad:~/catkin_ws$ rosrun rosserial_python 
message_info_service.py  serial_node.py           
glv@VaraPrasad:~/catkin_ws$ rosrun rosserial_python serial_node.py /dev/ttyACM1
[rosrun] Couldn't find executable named serial_node.py below /opt/ros/kinetic/share/rosserial_python

In this Tutorial I encountered this rosrun statement, why we need to run this glv@VaraPrasad:~/catkin_ws$ rosrun rosserial_python serial_node.py /dev/ttyACM1 what is the use of it. And how to overcome this error??

Thanks In Advance

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