Newbie issue

Hello!

I get this reponse when i deployed it to vercel and trying to login
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:3000/api/auth/sign-in/email?currentURL=https%3A%2F%2Fdemos-kj88v2vt1-madszbcs-projects.vercel.app%2Fauth%3Fredirect%3D%252F. (Reason: CORS request did not succeed). Status code: (null).

How can i fix that or atleast begin to fix it?
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