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rosserial_python Error

i am trying to connect my arduino with ROS i am following the hello world tutorial: i am using ROS Jade

when i come to the step following step: rosrun rosserial_python /dev/ttyUSB0

i receive an error of serial port as: [ERROR] [WallTime: 1455616377.748461] Error opening serial: could not open port /dev/ttyUSB0: [Errno 2] No such file or directory: '/dev/ttyUSB0'

i know its an error of the serial port but i am not able to solve it plz help me i really need help with this matter.