hey this usually happens when dlib did not install properly which is honestly super common first try running python -c import dlib and see if it throws an error if it does then thats the issue the easiest fix is to uninstall everything using pip uninstall dlib face_recognition -y and then reinstall using pip install dlib-bin and after that install your face recognition library again also make sure you have cmake and c plus plus build tools installed especially if you are on windows otherwise dlib tends to fail silently during install if you are using python 3 12 that could also be causing problems so try switching to python 3 10

CMake missing, C++ compiler missing, Python version mismatch ---> one of the tree probably