v4.1.17  Cannot apply `py-0.5`

Latest release: v4.1.17 (CLI standalone executable)

Im suddenly getting errors on simple stuff like:
Error: Cannot apply unknown utility class `py-0.5` or Cannot apply unknown utility class `md:px-2`

Call;
tailwindcss -i ./resources/css/frontend.css -o ./public/assets/css/frontend.css

Hope somebody can help me, @apply is such a great feature

Thanks