Cannot read properties "addEventListener" when initialising new subscription

Hello,

i took the example directly from https://www.npmjs.com/package/@ringcentral/subscriptions and used it on my application.

import 'dotenv/config'



import {SDK} from '@ringcentral/sdk';

import {Subscriptions} from '@ringcentral/subscriptions';



// init

const sdk = new SDK({

    server: 'https://platform.devtest.ringcentral.com',

    clientId: process.env.RC_APP_KEY,

    clientSecret: process.env.RC_APP_SECRET

});

const platform = sdk.platform();

const subscriptions = new Subscriptions({

    sdk: sdk,

});



const main = async () => {

    // login

    await platform.login({

        'jwt': process.env.RC_LOGIN_JWT

    });



    // subscribe

    const subscription = subscriptions.createSubscription();

    subscription.on(subscription.events.notification, evt => {

        console.log(JSON.stringify(evt, null, 2));

    });

    await subscription

        .setEventFilters(['/restapi/v1.0/account/~/extension/~/message-store'])

        .register();



    // trigger events

    const r = await platform.get('/restapi/v1.0/account/~/extension/~');

    const ext = await r.json();

    platform.post('/restapi/v1.0/account/~/extension/~/company-pager', {

        from: {extensionId: ext.id},

        to: [{extensionId: ext.id}],

        text: 'Hello world!',

    });

};



main();

When trying to run, i get the error:

TypeError: Cannot read properties of undefined (reading 'addEventListener')

    at Subscription.setupWsEventListener (C:Projects

ingcentral-service

ode_modules@rc-exwslibsubscription.js:22:21)

    at new Subscription (C:Projects

ingcentral-service

ode_modules@rc-exwslibsubscription.js:19:14)

    at WebSocketExtension.subscribe (C:Projects

ingcentral-service

ode_modules@rc-exwslibindex.js:315:30)

    at Subscription.<anonymous> (C:Projects

ingcentral-service

ode_modules@ringcentralsubscriptionslibSubscriptions.js:89:58)

    at step (C:Projects

ingcentral-service

ode_modules@ringcentralsubscriptionslibSubscriptions.js:48:23)

    at Object.next (C:Projects

ingcentral-service

ode_modules@ringcentralsubscriptionslibSubscriptions.js:29:53)

    at fulfilled (C:Projects

ingcentral-service

ode_modules@ringcentralsubscriptionslibSubscriptions.js:20:58)

    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Apparently the parameter 'ws' in /@rc-ex/ws/lib/subscription.js is undefined, resulting in an error when trying to add listeners.

Any help is appreciated

sdk version is 5.0.1

subscpriptions version is 5.0.1

Node version is v.18.17.1