next-auth custom auth window not defined - reactjs

Question

I am trying to use next-auth with my backend but it doesn't work. I use version 4 with typescript. The error is
{error: 'window is not defined', status: 200, ok: true, url: null}
Why?????. Thanks a lot.
My custom API /login result is
{
"data": {
"username": "test",
"users": {
"id": 2,
"username": "test",
"email": "test#test.com",
"createdAt": "2021-05-24",
"updatedAt": "2021-05-24",
"name": "John Smith",
"id_groups": 99,
"groups": "guest",
"avatar": null
},
"timestamp": 1646808511,
"jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiG9.eyJpc3MiOiJodHRwOlwvXC90d2luYXBwLml0IiwiYXVkIjoiaHR0cDpcL1wvdHdpbmFwcC5pdCIsImlhdCI6MTM1Njk5OTUyNCwibmJmIjoxMzU3MDAwMDAwLCJleHAiOjE2NDY4MTIxMTEsImRhdGEiOiJtYXJjb2JvbmNpIn0.R1aAX99GHmoSPRKv4Vnzso8iRjUhrDWhPEdq4oql_r0"
},
"status": "",
"code": 200
}
Now, I'm try to configure next auth
import NextAuth from "next-auth";
import CredentialsProvider from "next-auth/providers/credentials";
import gApi from "../../../api/gApi";
export default NextAuth({
session: {
strategy: "jwt",
},
providers: [
CredentialsProvider({
name: "credentials",
credentials: {
username: {label: "Username",type: "text", placeholder: "username"},
password: { label: "Passwort", type: "password" },
},
async authorize(credentials) {
const resp = await gApi.post("/login", JSON.stringify(credentials));
const user = resp.data;
console.log('CALL MY API');
console.log(resp);
if ( resp.status && user) {
return user;
}
return null;
},
}),
],
callbacks: {
async jwt({ token, user, account, isNewUser }) {
if (user) {
if (user.jwt) {
token = { accessToken: user.jwt };
}
}
return token;
},
async session({ session, token }) { // this token return above jwt()
session.accessToken = token.accessToken;
return session;
},
},
pages: {
signIn: "/auth/Login",
},
});
In my login page I have e simple form and i call with:
const onSubmit: SubmitHandler<FormData> = async data => {
const resp: any = await signIn("credentials", {
username: data.username,
password: data.password,
redirect: false,
});
console.log('RESPO signin');
console.log(resp);
if (resp && !resp.error) {
router.replace('/')
} else return;
}