Chapter 8 - Problem with launch file

I have same problem here. The reason is after source python3 setup file, “source ~/.catkin_ws_python3/devel/setup.bash”, the roslaunch cannot find the package. But if does not source the setup file, it will have problem to import tf package. The package run successfully under python2 environment. I also tired to do “catkin_make” under python3 env and source setup file, but it does not work.