Cannot run the second :roslaunch acl_sim perfect_tracker_and_sim.launch

[958117216]

Hello! When I run the second :roslaunch acl_sim perfect_tracker_and_sim.launch,I meet error:

... logging to /home/gyl/.ros/log/2af5c044-8e6d-11ec-a867-bcf1718f8dce/roslaunch-gyl-Lenovo-31967.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.

resource not found: hector_sensors_description ROS path [0]=/opt/ros/melodic/share/ros ROS path [1]=/home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim ROS path [2]=/home/gyl/ROS_Projects/FASTER/src/behavior_selector ROS path [3]=/home/gyl/ROS_Projects/FASTER/src/catkin_simple ROS path [4]=/home/gyl/ROS_Projects/FASTER/src/faster/thirdparty/DecompROS/decomp_ros_msgs ROS path [5]=/home/gyl/ROS_Projects/FASTER/src/faster/thirdparty/DecompROS/DecompUtil ROS path [6]=/home/gyl/ROS_Projects/FASTER/src/faster/thirdparty/DecompROS/decomp_ros_utils ROS path [7]=/home/gyl/ROS_Projects/FASTER/src/faster/thirdparty/DecompROS/decomp_test_node ROS path [8]=/home/gyl/ROS_Projects/FASTER/src/faster/faster_msgs ROS path [9]=/home/gyl/ROS_Projects/FASTER/src/acl-mapping/fla_msgs ROS path [10]=/home/gyl/ROS_Projects/FASTER/src/acl-mapping/fla_utils ROS path [11]=/home/gyl/ROS_Projects/FASTER/src/acl-mapping/depthmap_filter ROS path [12]=/home/gyl/ROS_Projects/FASTER/src/acl-mapping/global-mapper/global_mapper ROS path [13]=/home/gyl/ROS_Projects/FASTER/src/faster/thirdparty/jps3d ROS path [14]=/home/gyl/ROS_Projects/FASTER/src/snapstack_msgs ROS path [15]=/home/gyl/ROS_Projects/FASTER/src/faster/faster ROS path [16]=/home/gyl/ROS_Projects/FASTER/src/acl-mapping/global-mapper/global_mapper_ros ROS path [17]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Modules/common/msgs ROS path [18]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Modules/control ROS path [19]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Modules/mission ROS path [20]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Modules/slam ROS path [21]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Modules/planning ROS path [22]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Modules/ground_station ROS path [23]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Simulator/gazebo_simulator ROS path [24]=/home/gyl/ROS_Projects/GYL_ws/Prometheus/Experiment ROS path [25]=/opt/ros/melodic/share when processing file: /home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim/urdf/quadrotor_base.urdf.xacro included from: /home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim/urdf/quadrotor_with_asus.urdf.xacro included from: /home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim/urdf/quadrotor_with_asus.gazebo.xacro RLException: while processing /home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim/launch/spawn_quadrotor_with_asus.launch: while processing /home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim/launch/spawn_quadrotor.launch: Invalid tag: Cannot load command parameter [robot_description]: command [['/opt/ros/melodic/lib/xacro/xacro', '/home/gyl/ROS_Projects/FASTER/src/acl-gazebo/acl_sim/urdf/quadrotor_with_asus.gazebo.xacro', 'base_link_frame:=/base_link', 'world_frame:=world']] returned with code [2].

Param xml is The traceback for the exception was written to the log file

[958117216]

git clone https://github.com/tu-darmstadt-ros-pkg/hector_models , get the hector_sensors_description ros package. the question is solved!