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

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when I try to launch the roslaunch rbkairos_sim_bringup rbkairos_complete.launch` file, it gives me this error.

resource not found: ur_description
ROS path [0]=/opt/ros/melodic/share/ros
ROS path [1]=/home/impaidk/work_ws/src/abb_experimental/abb_experimental
ROS path [2]=/home/impaidk/work_ws/src/abb_experimental/abb_irb1200_5_90_moveit_config
ROS path [3]=/home/impaidk/work_ws/src/abb_experimental/abb_irb1200_7_70_moveit_config
...
ROS path [149]=/home/impaidk/catkin_ws/src/mavros/test_mavros
ROS path [150]=/opt/ros/melodic/share
when processing file: /home/impaidk/work_ws/src/rbkairos_common/rbkairos_description/robots/versions/rbkairos_ur5_egh.urdf.xacro
RLException: while processing /home/impaidk/work_ws/src/rbkairos_sim/rbkairos_gazebo/launch/rbkairos_gazebo.launch:
while processing /home/impaidk/work_ws/src/rbkairos_sim/rbkairos_gazebo/launch/rbkairos_one_robot.launch:
Invalid <param> tag: Cannot load command parameter [robot_description]: command [/opt/ros/melodic/share/xacro/xacro.py '/home/impaidk/work_ws/src/rbkairos_common/rbkairos_description/robots/versions/rbkairos_ur5_egh.urdf.xacro' prefix:=robot_ ros_planar_move_plugin:=true load_kinematics_file:=false ] returned with code [2]. 

Param xml is <param command="$(find xacro)/xacro.py '$(find rbkairos_description)/robots/$(arg xacro_robot)' prefix:=$(arg prefix) ros_planar_move_plugin:=$(arg ros_planar_move_plugin) load_kinematics_file:=$(arg load_arm_kinematics_file) " name="robot_description"/>
The traceback for the exception was written to the log file

According to another similar question raised by a user https://answers.ros.org/question/1220...

I tried this command rosrun xacro xacro.py /home/impaidk/catkin_ws/src/rbkairos_common/rbkairos_description/robots/versions/rbkairos_ur5_egh.urdf.xacro to check if there are any problem in the xacro but i get this result.

resource not found: ur_description ROS path [0]=/opt/ros/melodic/share/ros ROS path [1]=/home/impaidk/catkin_ws/src/abb_experimental/abb_experimental ROS path [2]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb1200_5_90_moveit_config ROS path [3]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb1200_7_70_moveit_config ROS path [4]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb1200_gazebo ROS path [5]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb1200_support ROS path [6]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb120_gazebo ROS path [7]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb120_moveit_config ROS path [8]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb120_support ROS path [9]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb120t_moveit_config ROS path [10]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb1600_6_12_moveit_config ROS path [11]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb1600_support ROS path [12]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb2600_support ROS path [13]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb4600_support ROS path [14]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb52_support ROS path [15]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb6650s_support ROS path [16]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb6700_support ROS path [17]=/home/impaidk/catkin_ws/src/abb_experimental/abb_irb7600_support ROS path [18]=/home/impaidk/catkin_ws/src/geometry2/geometry2 ROS path [19]=/home/impaidk/catkin_ws/src/goethe_backyard ROS path [20]=/home/impaidk/catkin_ws/src/hector_localization/hector_localization ROS path [21]=/home/impaidk/catkin_ws/src/hector_localization/hector_pose_estimation_core ROS path [22]=/home/impaidk/catkin_ws/src/hector_localization/hector_pose_estimation ROS path [23]=/home/impaidk/catkin_ws/src/hector_quadrotor/hector_quadrotor ROS path [24]=/home/impaidk/catkin_ws/src/hector_quadrotor/hector_quadrotor_demo ROS path [25]=/home/impaidk/catkin_ws/src/hector_quadrotor/hector_quadrotor_description ROS path [26]=/home/impaidk/catkin_ws/src/hector_quadrotor/hector_uav_msgs ROS path [27]=/home/impaidk/catkin_ws/src/hector_quadrotor/hector_quadrotor_model ROS path [28]=/home/impaidk/catkin_ws/src/hector_quadrotor/hector_quadrotor_gazebo_plugins ROS path [29]=/home/impaidk/catkin_ws ... (more)