loading initial cache file ../settings.cmake
CMake Error: Error: generator : Ninja
Does not match the generator used previously: Unix Makefiles
Either remove the CMakeCache.txt file and CMakeFiles directory or choose a different
These errors indicate that CMake already believes a project has been created in the target
directory and that this project was a Makefile based project. Is there any CMakeCache.txt
files located anywhere in the project structure that may be causing CMake to get confused?
Otherwise you could reinitialise the tutorial project and try initialising hello-world
again and that would also fix your problem.