无法读取未定义的属性'token\u data'

我已经用密码验证了用户。为什么需要代币?还是权限问题?似乎这些状态没有被预期/处理。

打开默认领域时出错:

import React, { Component } from 'react'
import { FlatList } from 'react-native'
import Realm from 'realm'

export default class RealmTest extends React.Component {
    constructor(props) {
        super(props);
        this.state = { realm: null };
    }

    componentWillMount() {
        const authURL  = 'https://duel.de1a.cloud.realm.io'
        const realmURL = 'realms://duel.de1a.cloud.realm.io'
        const username = 'test'
        const password = 'test'

        Realm.Sync.User.login(authURL, username, password)
        .then((user) => {
            //Realm.open({
            let realm = new Realm({
                schema: [ { name: 'Dog', properties: { name: 'string' } } ],
                sync: { user, url: realmURL},
                //schemaVersion: 1
            })
            //.then((realm) => {
            const dogs = realm.objects('Dog');
            dogs.addListener(() => {
                this.forceUpdate();
            });
            this.setState({ realm });
            //});
        })
        .catch(error => {
            console.warn("Authentication failed")
        });
    }

    renderList(realm) {
        if (! realm) {
            return <Text>"No realm objects"</Text>
        }
        else {
            return (
                <FlatList
                    data={realm.objects('Dog')}
                    keyExtractor={(item) => item.name}
                    renderItem={({item}) => <Text>{item.name}</Text>}
                />
            )
        }
    }

    render() {
        const info = this.state.realm
        ? 'Number of dogs in this Realm: ' + this.state.realm.objects('Dog').length
        : 'Loading...';

        return (
            <View>
                {this.renderList(this.state.realm)}
                <Text>{info}</Text>
            </View>
        );
    }
}