React Native Expo problem

I’m currently taking the react native course, and i ran into a major problem.
when i run npm start, it opens the browser and expo cli, but gets stuck on “Starting Metro Bundler” and not going anywhere from there.
yesterday i did the same thing and it worked perfectly.
i saw online that a lot of people encountared the smae problem and none of the solutions there worked for me.
any ideas?
thanks in advance