Error while installing kinect on ros noetic

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i am having ubuntu 20.04 installed with ros noetic and i wanted to use kinect on it. Hence i followed the following documented page: "https://aibegins.net/2020/11/22/give-...". Finally, while using the command : "roslaunch freenect_launch freenect.launch depth_registration:=true" , i got the following error: RLException: [freenect.launch] is neither a launch file in package [freenect_launch] nor is [freenect_launch] a launch file name The traceback for the exception was written to the log file