RLException: while processing /home/kaos5-q/catkin_ws/src/turtlebot3/turtlebot3_bringup/launch/includes/description.launch.xml:

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To start up I'm trying to run Rviz on my remote pc but there's a step that gives me an error. By the way I'm following the steps on the following website |section 7|. http://emanual.robotis.com/docs/en/pl...

Something that might be useful to know

1. I'm running melodic on remote pc, Ubuntu 18.04.

2. I'm running kinetic on turtlebot pc, Ubuntu MATE 16.04.

   • To begin with I run roscore on my remote pc.
   • Second- I ran roslaunch turtlebot3_bringup turtlebot3_robot.launch on my turtle pc.

Those steps work completely fine. Now I'm supposed to export TURTLEBOT3_MODEL=${TB3_MODEL}on my remote pc so it recognizes my turtle pc. In this case I don't have too because I've permanently set the export settings. So the next step will be running roslaunch turtlebot3_bringup turtlebot3_remote.launch on my remote pc but this step prints out this error on my terminal!

... logging to /home/kaos5-q/.ros/log/d1a5ea46-5260-11e9-ad66-7085c28192a7/roslaunch-kaos5q-desktop-4477.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.

xacro: in-order processing became default in ROS Melodic. You can drop the option.
substitution args not supported:  No module named 'rospkg'
when processing file: /home/kaos5-q/catkin_ws/src/turtlebot3/turtlebot3_description/urdf/turtlebot3_burger.urdf.xacro
RLException: while processing /home/kaos5-q/catkin_ws/src/turtlebot3/turtlebot3_bringup/launch/includes/description.launch.xml:
Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/melodic/lib/xacro/xacro --inorder '/home/kaos5-q/catkin_ws/src/turtlebot3/turtlebot3_description/urdf/turtlebot3_burger.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

I'm kind of new to this area of ROS and working with terminal so please excuse my ignorance.