Invalid <param> tag: Cannot load command parameter [robot_description]:

edit

Im using ros kinetic and Ubuntu 16.04

Im trying to do run this project from [ https://github.com/erlerobot/gym-gazebo ] but not running inside a docker container.

After, I had done

user@user-HP-Pavilion-15-Notebook-PC:~/gym-gazebo/gym_gazebo/envs/installation/catkin_ws$ catkin_make
user@user-HP-Pavilion-15-Notebook-PC:~/gym-gazebo/gym_gazebo/envs/installation$ bash setup_kinetic.bash
user@user-HP-Pavilion-15-Notebook-PC:~/gym-gazebo/examples/turtlebot$ python circuit2_turtlebot_lidar_qlearn.py

Then, it comes out the following error:

... logging to /home/user/.ros/log/3ac6e572-28a3-11e8-9aba-142d27dccbb5/roslaunch-user-HP-Pavilion-15-Notebook-PC-6853.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://user-HP-Pavilion-15-Notebook-PC:37855/
ros_comm version 1.12.12


SUMMARY
========

PARAMETERS
 * /rosdistro: kinetic
 * /rosversion: 1.12.12

NODES

auto-starting new master
process[master]: started with pid [6864]
ROS_MASTER_URI=http://user-HP-Pavilion-15-Notebook-PC:11311/

setting /run_id to 3ac6e572-28a3-11e8-9aba-142d27dccbb5
process[rosout-1]: started with pid [6884]
started core service [/rosout]
Roscore launched!
Gazebo launched!
... logging to /home/user/.ros/log/3ac6e572-28a3-11e8-9aba-142d27dccbb5/roslaunch-user-HP-Pavilion-15-Notebook-PC-6908.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

while processing /home/user/gym-gazebo/gym_gazebo/envs/installation/catkin_ws/src/turtlebot_simulator/turtlebot_gazebo/launch/includes/kobuki.launch.xml:
Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/kinetic/lib/xacro/xacro --inorder '/home/user/gym-gazebo/gym_gazebo/envs/installation/catkin_ws/src/turtlebot/turtlebot_description/robots/kobuki_hexagons_asus_xtion_pro.urdf.xacro'] returned with code [2]. 

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

And the kobuki.launch.xml:

<launch>
  <arg name="base" />
  <arg name="stacks" />
  <arg name="3d_sensor" />
  <arg name="urdf_file" default="$(find xacro)/xacro --inorder '$(find turtlebot_description)/robots/$(arg base)_$(arg stacks)_$(arg 3d_sensor).urdf.xacro'" />
  <param name="robot_description" command="$(arg urdf_file)" />
  <!-- Gazebo model spawner -->
  <node name="spawn_turtlebot_model" pkg="gazebo_ros" type="spawn_model" args="$(optenv ROBOT_INITIAL_POSE) -unpause -urdf -param robot_description -model mobile_base" />
  <!-- Velocity muxer -->
  <node pkg="nodelet" type="nodelet" name="mobile_base_nodelet_manager" args="manager" />
  <node pkg="nodelet" type="nodelet" name="cmd_vel_mux" args="load yocs_cmd_vel_mux/CmdVelMuxNodelet mobile_base_nodelet_manager">
    <param name="yaml_cfg_file" value="$(find turtlebot_bringup)/param/mux.yaml" />
    <remap from="cmd_vel_mux/output" to="mobile_base/commands/velocity" />
  </node>
  <!-- Bumper/cliff to pointcloud (not working, as it needs sensors/core messages) -->
  <include file="$(find turtlebot_bringup)/launch/includes/kobuki/bumper2pc.launch.xml" />
</launch>

Im still new with ROS. So, do i miss something?

Appreciate to any help, Im stuck for 3 days