Hi, everyone I am using clearpath robot jackal to simulate navigation and follow the tutorial: https://www.clearpathrobotics.com/assets/guides/noetic/ros/ROS%20Navigation%20Basics.html

but as I Put the command :

source ~/jackal_navigation/devel/setup.bash
roslaunch jackal_gazebo jackal_world.launch config:=front_laser

the command line shows that:

... logging to /home/finn/.ros/log/7a5b11fe-091d-11ed-8c03-c779c62be7fc/roslaunch-finn-HP-Pavilion-Aero-Laptop-13-be0xxx-13796.log
Checking log directory for disk usage. This may take a while.
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.
resource not found: flir_camera_description
ROS path [0]=/opt/ros/noetic/share/ros
ROS path [1]=/home/finn/jackal_navigation/src
ROS path [2]=/opt/ros/noetic/share
when processing file: /home/finn/jackal_navigation/src/jackal/jackal_description/urdf/accessories.urdf.xacro
included from: /home/finn/jackal_navigation/src/jackal/jackal_description/urdf/jackal.urdf.xacro
RLException: while processing /home/finn/jackal_navigation/src/jackal_simulator/jackal_gazebo/launch/spawn_jackal.launch:
while processing /home/finn/jackal_navigation/src/jackal/jackal_description/launch/description.launch:
Invalid <param> tag: Cannot load command parameter [robot_description]: command [['/opt/ros/noetic/lib/jackal_description/env_run', '/home/finn/jackal_navigation/src/jackal/jackal_description/urdf/configs/front_laser', '/opt/ros/noetic/lib/xacro/xacro', '/home/finn/jackal_navigation/src/jackal/jackal_description/urdf/jackal.urdf.xacro', '--inorder']] returned with code [2]. 

Param xml is <param name="robot_description" command="$(find jackal_description)/scripts/$(arg env_runner)                     $(find jackal_description)/urdf/configs/$(arg config)                     $(find xacro)/xacro $(find jackal_description)/urdf/jackal.urdf.xacro                     --inorder"/>
The traceback for the exception was written to the log file

Does anyone know that problem? it will be appreciated if you have the idea.