Issue running default.launch

[gy2256]

First of all, thanks for providing this tool and the documentation is well written. Here is my development environment:

OS: Ubuntu 20.04
ROS: Noetic
XPlane: Xplane 10

I have followed the steps compile the workspace and finally get to the section Running XPlaneROS.

After setting up the

1. Open X-Plane 11 (X-Plane 11/X-Plane_x86_64).
2. Select New Flight.
3. In the LOCATION panel, set the location to Butler airport (ID : KBTP) with Runway 26.
4. Click Start Flight.

and I try to start the xplane ros
roslaunch xplane_ros default.launch

I get the following error:

auto-starting new master
process[master]: started with pid [33264]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 5eab2ac8-3af8-11ec-852e-ffe475eea05a
process[rosout-1]: started with pid [33274]
started core service [/rosout]
process[xplane_wrapper-2]: started with pid [33277]
process[ned_to_viz-3]: started with pid [33282]
process[xp_rosplane_viz-4]: started with pid [33283]
process[rviz-5]: started with pid [33284]
Traceback (most recent call last):
  File "/home/xv/xplane_ros_ws/devel/lib/xplane_ros/xplane_ros_wrapper.py", line 15, in <module>
    exec(compile(fh.read(), python_script, 'exec'), context)
  File "/home/xv/xplane_ros_ws/src/xplane_ros/scripts/xplane_ros_wrapper.py", line 5, in <module>
    from state_reader import StateReader
ModuleNotFoundError: No module named 'state_reader'

I am not sure if it's a Python problem or ROS workspace problem. The python script state_reader is located in the same folder scripts with xplane_ros_wrapper.py, but it cannot find the state_reader.py. So I edited the CMakeLists.txt file within xplane_ros package, by adding a line

catkin_install_python(PROGRAMS 
    scripts/xplane_ros_wrapper.py 
    scripts/state_reader.py # <- include state_reader.py 
    scripts/takeoff.py
    scripts/roll_hold.py
    scripts/ned_to_viz.py
    scripts/rosplane_tuner.py
    scripts/rosplane_path_viz.py
    DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
)

However, I am still not able to import the StateReader class, a new error message is shown below

setting /run_id to a9d84630-3aed-11ec-852e-ffe475eea05a
process[rosout-1]: started with pid [7073]
started core service [/rosout]
process[xplane_wrapper-2]: started with pid [7076]
process[ned_to_viz-3]: started with pid [7077]
process[xp_rosplane_viz-4]: started with pid [7078]
process[rviz-5]: started with pid [7083]
Traceback (most recent call last):
  File "/home/xv/xplane_ros_ws/devel/lib/xplane_ros/xplane_ros_wrapper.py", line 15, in <module>
    exec(compile(fh.read(), python_script, 'exec'), context)
  File "/home/xv/xplane_ros_ws/src/xplane_ros/scripts/xplane_ros_wrapper.py", line 5, in <module>
    from state_reader import StateReader
ImportError: cannot import name 'StateReader' from 'state_reader' (/home/xv/xplane_ros_ws/devel/.private/xplane_ros/lib/xplane_ros/state_reader.py)
[xplane_wrapper-2] process has died [pid 7076, exit code 1, cmd /home/xv/xplane_ros_ws/devel/lib/xplane_ros/xplane_ros_wrapper.py __name:=xplane_wrapper __log:=/home/xv/.ros/log/a9d84630-3aed-11ec-852e-ffe475eea05a/xplane_wrapper-2.log].
log file: /home/xv/.ros/log/a9d84630-3aed-11ec-852e-ffe475eea05a/xplane_wrapper-2*.log
[ WARN] [1635755298.803719113]: Invalid argument passed to canTransform argument source_frame in tf2 frame_ids cannot be empty

[gy2256]

OK. I have solved the problem by manually append /src/xplane_ros/scripts into PYTHONPATH by doing

PYTHONPATH=$PYTHONPATH:~/xplane_ros_ws/src/xplane_ros/scripts
export PYTHONPATH