How to configure communication with arduino

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Hi,

I'm trying to configure the communication using rosserial to arduino and to install everything.

I followed this tutorial http://wiki.ros.org/rosserial_arduino... and am trying to finish this one http://wiki.ros.org/rosserial_arduino...

Here is the error I am getting, I just cannot locate serial_node.py anywhere on my computer!

rosrun rosserial_python serial_node.py /dev/ttyUSB0

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

I couldn't find anyone having the same issue, any advice would be greatly appreciated.

Thank you very much!