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This question is a duplicate of http://answers.ros.org/question/2041/openni_kinect-rviz-display-error-pointcloud2-is which you asked a month ago.
This looks like a bug in rviz and/or a lack of support for your graphics hardware. You should probably file a bug against rviz. Use this wiki section for info on how to make a usable bug report: how to make a usable bug report.
Thanks.