no module named yaml
Dear ROS Team,
I have tried to install ROS on my Mac after having installed Macports etc as explained, and after typing "rosinstall ~/ros "http://packages.ros.org/cgi-bin/gen_rosinstall.py?rosdistro=diamondback&variant=desktop-full&overlay=no" in the terminal, I get the error message: ImportError: No module named yaml.
Do you have a hint?