i am using the libp2p-kad in rust ,how to implement it?

Question

pub async fn creat_kademlia_network() -> Result<(), Box<dyn Error>> {
    let local_key = identity::Keypair::generate_ed25519();
    let public_key = local_key.public();
    let local_peer_id = PeerId::from_public_key(&public_key);

    let mut store = MemoryStore::new(local_peer_id);

    let kademlia = Kademlia::new(local_peer_id, store);

    #[derive(NetworkBehaviour)]
    struct Behaviour {
        kademlia: Kademlia<MemoryStore>,
    }

    let behaviour: Behaviour = Behaviour { kademlia };

    let transport = development_transport(local_key).await?;

    let mut swarm =
        SwarmBuilder::with_async_std_executor(transport, behaviour, local_peer_id).build();

    Ok(())
}

When I write this codes, it reminds me that enter image description here

How should I solve it plz? and I insert the #[derive(NetworkBehaviour)] But it does not work!