Unable to locate the package when connecting kinect with ROS melodic in launch file

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I am using ubuntu LTS 18.04 and connect a kinect xbox 360 with it using the rtab mapping. Freenect driver is installed successfully but when i type the command it gives me the error saying unable to locate the package as a verification i also attached the screenshot along with it. Thanking in advance, any usefull advice would be highly appreciated. Futhur advice relating to the implementation of indoor mappinng would be highly appreciated.