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I'm a new user of ROS openni . Now I am using ubuntu 12.04 and my ROS dist is groovy. when I run the command rosrun openni_tracker openni_tracker,the only thing I got is a error message: InitFromXml failed: Can't create any node of the requested type!

I followed the solution above provided but no use

I googled a lot ,but not a correct solution for me.Any help will be appreciated ,It really drives me crazy.