AttributeError: 'module' object has no attribute 'main'

edit

Hello all! I want to run turtlebot simulation. It has been complied correctly. But I run the main.launch file it gives me the following error.

Traceback (most recent call last):
      File "/opt/ros/kinetic/lib/xacro/xacro", line 33, in <module>
        xacro.main()
    AttributeError: 'module' object has no attribute 'main'
    while processing /home/ibrahim/catkin_ws/src/turtlebot_simulator/turtlebot_gazebo/launch/includes/kobuki.launch.xml:
    Invalid <param> tag: Cannot load command parameter [turtlebot_description]: command [/opt/ros/kinetic/lib/xacro/xacro --inorder '/home/ibrahim/catkin_ws/src/turtlebot/turtlebot_description/robots/kobuki_hexagons_asus_xtion_pro.urdf.xacro'] returned with code [1]. 

    Param xml is <param command="$(arg urdf_file)" name="turtlebot_description"/>
    The traceback for the exception was written to the log file

In the initial lines it says no attribute main but I visit the address of this xacro.py file and I opened it with my editor like Visual Studio Code or can be opened with some other editors. following are the contents of xacro.py file. some comments are there but with just two lines of code.

import xacro
xacro.main()

So I removed main() and type again to check if it recognizes this function or not. so besides main() there are other attributes like math, macro, message etc appear in the sub menu. So main() function/attribute is there. I visited some similar posts but it didn't help me. If someone has faced this problem and solved it. Please help me to find its solution. Thanks.

when I type /opt/ros/kinetic/lib/xacro/xacro --inorder '/home/ibrahim/catkin_ws/src/turtlebot/turtlebot_description/robots/kobuki_hexagons_asus_xtion_pro.urdf.xacro'. It gives the following info.

<?xml version="1.0" ?>
<!-- =================================================================================== -->
<!-- |    This document was autogenerated by xacro from /home/ibrahim/catkin_ws/src/turtlebot/turtlebot_description/robots/kobuki_hexagons_asus_xtion_pro.urdf.xacro | -->
<!-- |    EDITING THIS FILE BY HAND IS NOT RECOMMENDED                                 | -->
<!-- =================================================================================== -->
<!--
    - Base      : kobuki
    - Stacks    : hexagons
    - 3d Sensor : kinect
-->
<robot name="turtlebot" xmlns:xacro="http://ros.org/wiki/xacro">
  <kobuki/>
  <stack_hexagons parent="base_link"/>
  <sensor_asus_xtion_pro parent="base_link"/>
</robot>

Command for running launch file is

roslaunch gym_construct main.launch

I want to run simulation environment so I can deploy and train turtlebot robot in it. First I need to run this environment and then run the package for turtlebot2. I am using openai_ROS.