Why it printout error

in the github code when i enter celeberate();
it need to play firework for ten second but in new-year-cards.netlify.app
i printout an undefined error

You’re trying to load /cards:


However, that results in a page not found: Page Not Found (new-year-cards.netlify.app). You probably need to fix that.

but i real have a file “cards”

Hi are you still experiencing this issue?

oh thx it fixed thanks your help