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

I was following a tutorial but when I typed:
C:\aseprite\build>cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DLAF_BACKEND=skia -DSKIA_DIR=C:\deps\skia -DSKIA_LIBRARY_DIR=C:\deps\skia\out\Release-x64 -DSKIA_LIBRARY=C:\deps\skia\out\Release-x64\skia.lib -G Ninja …
it had an error saying C:/aseprite does not appear to contain CMakeLists.txt. I am very new to all of this and I am not sure what most of it means, but can you help me fix this error