source_frame in tf2 frame_ids cannot start with a '/' like
[ERROR] [1561118780.508600034]: TF Exception that should never happen for sensor frame: , cloud frame: /camera_depth_frame, Invalid argument "/camera_depth_frame" passed to lookupTransform argument source_frame in tf2 frame_ids cannot start with a '/' like:
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ncnynl
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去掉/既可以，如下：