roslaunch pr2_moveit_config demo.launch not working

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I am using Ubuntu 16.04 with ROS Kinetic. After doing all required prerequisites for this tutorial: http://docs.ros.org/kinetic/api/movei... I still get the following error: [demo.launch] is neither a launch file in package [pr2_moveit_config] nor is [pr2_moveit_config] a launch file name The traceback for the exception was written to the log file

After looking through the forum and trying the suggested solutions, this won't go away. Another thing that happened during the setup assistant was that the pr2 robot was not fully displayed. Just three parts of it. Everything else, including the save-step at the end worked properly. Any ideas?

Thank you!