Why does the CMake command show "The source directory "/home/shubham" does not appear to contain CMakeLists.txt."?

Question

I am installing libfreenect2 on Linux.

I am following the steps given in https://github.com/OpenKinect/libfreenect2.

Command

cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/freenect2"

gives me an error:

"CMake Error: The source directory "/home/shubham" does not appear to contain CMakeLists.txt.

When I searched for "CMakeLists.txt" file, it is in the libfreenect2 folder.