Hi, I’m trying to finish the last excercise from the Programming Drones with ROS course, but I’m getting an import error when trying to run:
rosrun drone_application follow_trajectory.py _real_drone:=false _aruco_coords:=false _visualise_trajectory:=false
Previously I had to download the repository from eYIPS:
Since the repository given in the course (git clone GitHub - tum-vision/tum_ardrone: Repository for the tum_ardrone ROS package, implementing autonomous flight with PTAM-based visual navigation for the Parrot AR.Drone.) did not contain the drone_application package which contains the move_to_waypoint.py and follow_trajectory.py scripts shown to be used in the course. (<-- Actually I do not know what is the point of downloading this ardrone_tum repository since it is not being used as far as I know. Could it be a mistake in referencing the repository?)
Anyways, I deleted the devel and build folders using rm -rf devel build command, and then I compiled the packages from the catkin_ws.
I launched the load_octomap.launch file, as well as the ardrone_navigation.launch files created through the course, without errors.
When running rosrun drone_application move_to_waypoint.py _real_drone:=false _aruco_mapping:=false I initially got an error about the aruco_mapping.msg module not being able to be found, however since later I read that we’re not using the ArucoMarker, I just commented this import and managed to run succesfully the command. I don’t know if this was right to do, but it’s still not clear to me how to install such module. (I’m thinking it’s just a matter of downloading a repository and compiling it, but I haven’t tried - any guidance will be appreciated)
The problem I’m facing is that now it seems that this import:
is now causing problems.
I tried installing the pyquaternion library using python3 -m pip install pyquaternion to no avail:
I would like to be able to complete the exercise (see the drone moving in the gazebo simulation after giving the goal through the MoveIt RViz window), but I don’t know what else to do. Hopefully someone here can help me.
Thanks in advance! 
