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I am trying to use velodyne_height_map for velodyne HDL-32E.

Actually I am new to ROS and to the website also thatswhy posting my question here as the website says I nee dto increase my karma to post it on the website.

I read this link(http://wiki.ros.org/velodyne_height_map) carefully but may not have understood it completely so here is what is did.

1. roslaunch velodyne_pointcloud 32e_points.launch calibration:=/home/user/32db.yaml (i.e. calling the velodyne point cloud which i think is subscriber and velodyne basic driver)
2. rosrun nodelet nodelet standalone velodyne_height_map/HeightMapNodelet (for using height based algo to get obstacles.) But, Its constantly showing this error

ERROR: