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I am pretty new to ros and even to linux. I faced the same error. What I did is the following: 1. go to the location provided in the error '/opt/ros/indigo/share/rgbd_launch/launch/includes/' and using nano or any other editor open the file 'processing.launch.xml'. 2. There will be several sections in there. Under the section 'Remapping Arguments', add this line

<arg name="depth_registered_filtered" default="depth_registered"/>

(just like the several others already there.)

  1. Then try to run 'roslaunch openni_launch openni.launch' again and see if this works.

It solved the error for me, but I do not know why this works.