Unable to launch a python node using rosrun in ROS-Noetic (Ubuntu20)

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COMMAND:

rosrun my_robot_tutorial robot_news_radio_transmitter.py   //python publisher node
rosrun my_robot_tutorial smartphone.py    //python subscriber node

ERROR:

/opt/ros/noetic/bin/rosrun: /home/rishav/catkin_ws/src/my_robot_tutorials/scripts/smartphone.py: **usr/bin/env: bad interpreter: No such file or directory**
/opt/ros/noetic/bin/rosrun: line 150: /home/rishav/catkin_ws/src/my_robot_tutorials/scripts/smartphone.py: Success

FILE CONTENT OF smartphone.py:

#!usr/bin/env python3

import rospy
from std_msgs.msg import String 


def callback_receive_radio_data(msg):
    rospy.loginfo("Message received : ")
    rospy.loginfo(msg)

if __name__ == '__main__':
    rospy.init_node('smartphone')

    sub = rospy.Subscriber("/robot_news_radio", String, callback_receive_radio_data)


    rospy.spin()

ISSUE:

This error occurred when I tried to launch the python subscriber node. please give me a solution