roswtf errors after following Install and Configuration of ROS Tutorial

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I'm new to ROS so I'm following the beginner tutorials. After following the install and configuration steps for my system (ubuntu 13.04), I get the following message from roswtf;

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Static checks summary:

Found 2 warning(s). Warnings are things that may be just fine, but are sometimes at fault

WARNING You are missing core ROS Python modules: rosrelease -- WARNING You are missing Debian packages for core ROS Python modules: rosrelease (python-rosrelease) --

Found 2 error(s).

ERROR Not all paths in ROS_PACKAGE_PATH [/home/gaynier/catkin_ws/src:/opt/ros/hydro/share:/opt/ros/hydro/stacks] point to an existing directory: * /opt/ros/hydro/stacks

ERROR Not all paths in PYTHONPATH [/home/gaynier/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/hydro/lib/python2.7/dist-packages] point to a directory: * /home/gaynier/catkin_ws/devel/lib/python2.7/dist-packages

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Sooooo, wtf?