Comment by po1 for There has been a recent change in the rosdistro system, and tools such as rosdep have been updated. I would recommend the following two things:Make sure rosdep is up to date:sudo apt-get updatesudo apt-get install python-rosdepRun sudo rosdep init to reinitialize your /etc/ros/rosdep/sources.list.d, then rosdep update to update your local cache

Then it means that the ROSPi repo has not been updated with the latest rosdep. Uninstall any version of rosdep and install it from pip: `sudo pip install -U rosdep`, that should do it