I dont understand this

[TN19Nworking]

i have this code

pub fn router() -> OpenApiRouter {
    let router = Router::new()
        .route("/", get(login));
	OpenApiRouter::new().nest(
		"/v1/auth",
		OpenApiRouter::new()
			.routes(routes!(login))
			.routes(routes!(sing_up)),
	)
}

#[derive(Deserialize, ToSchema, Debug)]
struct LoginRequest {
	pub password: String,
}

#[utoipa::path(
    post,
    path = "/login",
    responses(
        (status = OK, description = "text", content_type = "text/plain")
    ),
    tag = AUTHENTICATION_TAG
)]
async fn login(
    State(config): State<Arc<Config>>,
    Json(body): Json<LoginRequest>,
) -> &'static str {
    info!("config: {config:#?}");
    info!("body: {body:#?}");
	"login"
}

The Axum part, including the router, works, but the OpenApiRouter part has an error that I don't understand.
Error:

error[E0308]: mismatched types
   --> backend/services/gateway/src/authentication/mod.rs:19:3
    |
17  |       OpenApiRouter::new().nest(
    |                            ---- arguments to this method are incorrect
18  |           "/v1/auth",
19  | /         OpenApiRouter::new()
20  | |             .routes(routes!(login))
21  | |             .routes(routes!(sing_up)),
    | |_____________________________________^ expected `OpenApiRouter`, found `OpenApiRouter<Arc<Config>>`
    |
    = note: expected struct `utoipa_axum::router::OpenApiRouter<()>`
               found struct `utoipa_axum::router::OpenApiRouter<std::sync::Arc<utils::config::Config>>`
note: method defined here
   --> /Users/tn19n/.cargo/registry/src/index.crates.io-6f17d22bba15001f/utoipa-axum-0.1.1/src/router.rs:315:12
    |
315 |     pub fn nest(self, path: &str, router: OpenApiRouter<S>) -> Self {
    |            ^^^^

[TN19Nworking]

I just found out it's an Axum thing.