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The error that you are getting says that you are trying to perform a transform to/from a frame that does not exist. This is most likely because your laser topic contains a frame_id named "/laser", but your static transform publisher is publishing a transform from "base_laser" instead. You need to make sure that the frame_id on this incoming message is correct.

The string "base_link" in transformLaserScanToPointCloud is the frame_id that you want to transform the cloud into. This is simply declared by you based on what you want to do. There is no default value.