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When you are importing, Python is looking for, but not finding a folder called msg, which has to be in the exact spot it expects, which is (I think):
"/home/patrick/Dropbox/Robotics/catkin_ws/src/skeleton_markers/msg"
If you have put your msg folder inside your 'nodes' folder, it might not find it. You could move the folder, or change the import to from skeleton_markers.nodes.msg