Can't open MongoDB Realm

The problem

I’m new to MongoDB realm. And to learn more about the product i followed the React Native with javascript tutorial. After doing so, i started to sandbox the library by testing the anonymous( ) log in. But unfortunately every time the code tries to open the tutorial realm, this error happens:

Error opening realm: {
  \"line\": 102194,
  \"column\": 47,
  \"sourceURL\": \"http://localhost:8081/index.bundle?platform=android&dev=true&minify=false\"
}

The troubleshooting

Looking up the line 102194 was the first attempt, and this is it’s content:

var behavior = realmConstructor.exists(config) ? "existingRealmFileBehavior" : "newRealmFileBehavior";

The second attempt was looking at the open( ) documentation. As far as i could see nothing is missed in the code.

The set up

Node js v15.2.1
React Native v0.63.3
MongoDB Realm v4.4 (same as tutorial)

The code

import Realm from 'realm';

let app;

const getRealm = getRealmApp();

async function openRealm(gotUser) {

    try {

        let userKey = '5fc2945329e5d0fc6d53f5bb';

        const config = {

            sync: {

                gotUser,

                partitionValue: `user=${userKey}`,

            },

        };

        Realm.open(config).then((userRealm) => {

            const dataUser = userRealm;

            const gotData = dataUser.objects("User");

            console.log(`The realm objects are: ${gotData}`);

        });

    } catch (error) {

        throw `Error opening realm: ${JSON.stringify(error, null, 2)}`;

    }

}

function getRealmApp() {

    if (app === undefined) {

        const appId = 'tasktracker-wqoyx';

        const appConfig = {

            id: appId,

            timeout: 10000,

        };

        app = new Realm.App(appConfig);

    }

    return app;

};

async function logInAsync() {

    try {

        const creds = Realm.Credentials.anonymous();

        const newUser = await getRealm.logIn(creds);

        console.log('user authenticated!', newUser.isLoggedIn);

        openRealm(newUser);

    } catch (error) {

        console.log(`Unable to log in because: ${error}`)

    }

}

export const onPressSignIn = async () => {

    try {

        await logInAsync();

    } catch (error) {

        Alert.alert(`Failed to log in: ${error.message}`);

    }

}

Any help is appreciated. Thanks in advance!