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It looks like your launch file isn't setting the svo/cam_model parameter, which the svo node requires in order to run.

From looking at the current version of svo_ros, it looks like the camera calibration yaml files that they supply have changed names; they're now param/camera_atan.yaml and param/camera_pinhole.yaml, and the latest version of the launch file references param/camera_atan.yaml: https://github.com/uzh-rpg/rpg_svo/blob/2eabd6d4b415635c45d6e91278cb9b1f06439da7/svo_ros/launch/live.launch

I'm a little surprised that the rosparam tag doesn't complain that it can't find the yaml file in question.