[ros-users] "Service not found" during camera calibration

My launch file

<launch>
<node name="usb_cam" pkg="usb_cam" type="usb_cam_node" output="screen" >






</node>

<!--
  <node name="image_view" pkg="image_view" type="image_view" respawn="false"
output="screen">
    <remap from="image" to="/usb_cam/image_raw"/>
  </node>
-->

</launch>

rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108
image:=/usb_cam/image_raw camera:=/usb_cam
Waiting for service /usb_cam/set_camera_info ...
Service not found

How to run camera calibration in correct way?



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