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Slightly different error, but this might help someone who stumbled upon the same problem later: When you get
ERROR: cannot launch node of type [path_to_file] package_path
ROS path [0]=/opt/ros/...
...
triple check your launch file. In my case I had written my launch file as:
<node name="talker" pkg="$(find beginner_tutorials)" type="talker"/>
instead of:
<node name="talker" pkg="beginner_tutorials" type="talker"/>
So make sure you don't include the find tag.
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