I'm trying to use RotorS for system ID purpose but it show the errors like below.
Have any idea?

$ roslaunch rotors_gazebo mav.launch
... logging to /home/sg/.ros/log/a06429c2-7b24-11eb-aaac-a85e45e6c65b/roslaunch-sg-10146.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.

redefining global property: pi
when processing file: /home/sg/catkin_ws/src/rotors_simulator/rotors_description/urdf/component_snippets.xacro
included from: /home/sg/catkin_ws/src/rotors_simulator/rotors_description/urdf/firefly_base.xacro
started roslaunch server http://sg:36581/

SUMMARY

PARAMETERS

• /firefly/robot_description: <?xml version="1....
• /firefly/tf_prefix:
• /gazebo/enable_ros_network: True
• /rosdistro: melodic
• /rosversion: 1.14.10
• /use_sim_time: True

NODES
/
gazebo (gazebo_ros/gzserver)
gazebo_gui (gazebo_ros/gzclient)
/firefly/
spawn_firefly (gazebo_ros/spawn_model)

auto-starting new master
process[master]: started with pid [10159]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to a06429c2-7b24-11eb-aaac-a85e45e6c65b
process[rosout-1]: started with pid [10170]
started core service [/rosout]
process[gazebo-2]: started with pid [10173]
process[gazebo_gui-3]: started with pid [10182]
process[firefly/spawn_firefly-4]: started with pid [10187]
[ INFO] [1614668281.515324299]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1614668281.516312139]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
[ INFO] [1614668281.542289940]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1614668281.543125175]: waitForService: Service [/gazebo_gui/set_physics_properties] has not been advertised, waiting...
[INFO] [1614668281.765485, 0.000000]: Loading model XML from ros parameter robot_description
[INFO] [1614668281.770620, 0.000000]: Waiting for service /gazebo/spawn_urdf_model
[ INFO] [1614668282.815874700]: waitForService: Service [/gazebo/set_physics_properties] is now available.
[ INFO] [1614668282.827225844]: Physics dynamic reconfigure ready.
[INFO] [1614668282.974797, 0.000000]: Calling service /gazebo/spawn_urdf_model
[INFO] [1614668283.090899, 0.000000]: Spawn status: SpawnModel: Successfully spawned entity
gzserver: symbol lookup error: /home/sg/catkin_ws/devel/lib/librotors_gazebo_multirotor_base_plugin.so: undefined symbol: _ZN14gz_sensor_msgs9ActuatorsC1Ev
[gazebo-2] process has died [pid 10173, exit code 127, cmd /opt/ros/melodic/lib/gazebo_ros/gzserver -u -e ode /home/sg/catkin_ws/src/rotors_simulator/rotors_gazebo/worlds/basic.world __name:=gazebo __log:=/home/sg/.ros/log/a06429c2-7b24-11eb-aaac-a85e45e6c65b/gazebo-2.log].
log file: /home/sg/.ros/log/a06429c2-7b24-11eb-aaac-a85e45e6c65b/gazebo-2*.log
[firefly/spawn_firefly-4] process has finished cleanly
log file: /home/sg/.ros/log/a06429c2-7b24-11eb-aaac-a85e45e6c65b/firefly-spawn_firefly-4*.log