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Hi @DavidXiong,

The pi_face_tracker_gui package (created by Scott Bell) requires the older Version 1 rosbridge package which can be found here. It looks like you have rosbridge_suite installed which I believe is the newer Version 2 rosbridge. So you can either install the Version 1 rosbridge or just comment out the <depend> line in the manifest.xml for the pi_face_tracker_gui assuming you can do without the GUI for now. (The rest of the pi_face_tracker package does not require the GUI.)