How can I debug this error please ?

 import NextAuth from 'next-auth';
import CredentialsProvider from 'next-auth/providers/credentials';

const handler = NextAuth({
    session: {
        strategy: 'jwt',
    },
    pages: {
        signIn: '/login',
    },
    providers: [
        CredentialsProvider({
            id: "credentials",
            type: "credentials",
            name: "credentials",
            credentials: {
                email: { label: 'Email', type: 'email' },
                password: { label: 'Password', type: 'password' },
            },
            async authorize(credentials, req) {

                console.log('============================= AUTHORIZE route.ts ======================')
                console.log("credentials:", credentials); // Log the credentials
                console.log("req:", req); // Log the request object

                // const user = { id: "1", name: "J Smith", email: "jsmith@example.com" }
                //
                // const passwordCorrect = false;
                //
                // if (passwordCorrect) {
                //     return {
                //         id: user.id,
                //         email: user.email,
                //     };
                // }

                return null;
            },
        }),
    ],
    callbacks: {
        async signIn({ user, account, profile, email, credentials }) {

            console.log('route.ts -> callbacks signIn')
            return true
        },
        async redirect({ url, baseUrl }) {
            return baseUrl
        },
        async session({ session, user, token }) {
            return session
        },
        async jwt({ token, user, account, profile, isNewUser }) {
            return token
        }
    }
});

export { handler as GET, handler as POST };