Thanks @patrickelectric for the report. However we ask that you please ask questions on http://answers.ros.org following our support guidelines: http://wiki.ros.org/Support
ROS Discourse is for news and general interest discussions. ROS Answers provides a forum which can be filtered by tags to make sure the relevant people can find and/or answer the question, and not overload everyone with hundreds of posts.
(To reproduce manually with a minimal example you can try to source your workspace and run rospack find xacro and if it fails look at if you can import it with the resulting PYTHONPATH)