Unable to broadcast the turtle position to tf2 , Tutorial: turtle_tf2_demo.launch and getting only one turtle

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Hello, i am new to ROS and i was learning tf2 from tutorial, while running this command: roslaunch turtle_tf2 turtle_tf2_demo.launch i got only one turtle and its not broadcasting its postion to tf2 while running rosrun tf tf_echo turtle1 turtle2

this is my terminal output after running roslaunch turtle_tf2 turtle_tf2_demo.launch:

process[turtle2_tf2_broadcaster-5]: started with pid [21884]
/usr/bin/env: ‘python’: No such file or directory
process[turtle_pointer-6]: started with pid [21885]
/usr/bin/env: ‘python’: No such file or directory
[turtle1_tf2_broadcaster-4] process has died [pid 21883, exit code 127, cmd /opt/ros/noetic/lib/turtle_tf2/turtle_tf2_broadcaster.py __name:=turtle1_tf2_broadcaster __log:=/home/himanshi/.ros/log/9ddee9c0-c7e3-11ea-9df6-61175895b819/turtle1_tf2_broadcaster-4.log].

I think i am using python3 thats why getting this problem , but dont know how to solve it.

please suggest me what should i do.

Thank you,

with regards, Himanshi