ImportError: cannot import name '_cffirmware' from 'pycrazyswarm.cfsim'

[ElaineYao]

I'm following the guideline for physical robots and simulation.

$ cd ros_ws/src/crazyswarm/scripts
$ source ../../../devel/setup.bash
$ $CSW_PYTHON -m pytest

After I run $CSW_PYTHON -m pytest, it gave me the error ImportError: cannot import name '_cffirmware' from 'pycrazyswarm.cfsim'

Plus, since my laptop is Ubuntu 20.04 with python 3.8 and ROS Noetic, in the build.sh, I add one line to compile it.

# ros
cd ros_ws
catkin_make -DPYTHON_EXECUTABLE=/usr/bin/python3  # I add this
catkin_make -DCMAKE_BUILD_TYPE=RelWithDebInfo
cd $ROOT

[jpreiss]

this step in build.sh must have failed:

crazyswarm/build.sh

Lines 20 to 23 in 967723d

	# build simulator firmware backend
	cd ros_ws/src/crazyswarm/scripts/pycrazyswarm/cfsim
	make
	cd $ROOT