Strange error with node-apn 2.2.0

Question

I am using node-apn version 2.2.0 and am getting an error that I did not find in their github issues' list. Here is the exception trace:

pushMessage: '123' } at for_IOS_push (/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/application/controller-service-layer/services/PushNotificationServiceV12.js:254:12)
[2019-05-07 09:43:15] ERROR Tue, 07 May 2019 09:43:15 GMT uncaughtException: this.getStream(...).then(...).catch is not a function at (/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/configurations/Bootstrap.js:129:15)
[2019-05-07 09:43:15] ERROR TypeError: this.getStream(...).then(...).catch is not a function
at Client.write (/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/node_modules/apn/lib/client.js:114:13)
at Promise.all.recipients.map.token (/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/node_modules/apn/lib/provider.js:29:62)
at Array.map ()
at Provider.send (/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/node_modules/apn/lib/provider.js:29:36)
at for_IOS_push (/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/application/controller-service-layer/services/PushNotificationServiceV12.js:304:17)
at /home/ubuntu/Office-Curry-Server/Office-Curry-Backend/application/controller-service-layer/services/PushNotificationServiceV12.js:455:29
at /home/ubuntu/Office-Curry-Server/Office-Curry-Backend/node_modules/async/lib/async.js:52:16
at /home/ubuntu/Office-Curry-Server/Office-Curry-Backend/node_modules/async/lib/async.js:527:17
at /home/ubuntu/Office-Curry-Server/Office-Curry-Backend/node_modules/async/lib/async.js

I am using node version 9.2.1.

Here are the options that I initialize the provider with:

{"token":
   {"key":"/home/ubuntu/Office-Curry-Server/Office-Curry-Backend/certificate/AuthKey_4F29WHN247.p8",
   "keyId":"4F29WHN247",
   "teamId":"8E3M5LT2S6"},
"production":false}

DeviceId, I checked, is also valid. I get this error right when I call apnProvider.send().then() and the error comes from the file "client.js" inside node_modules/apn/lib.

Here is the node-javascript code:

var for_IOS_push = function(devices, unread_count, groupType, apnProvider, isSilentPush, pushInfo, postDetails, next) {

    var myDevice = devices[0];
    console.log("Sending notification to device ID: ", myDevice);

    var note = new apn.Notification();

    note.expiry = Math.round(new Date().getTime() / 1000) + 3600; // Expires 1 hour from now.
    note.badge = unread_count;
    note.topic = "com.officecurry";
    // note.category = groupType;

    //note.groupType = groupType;
    isSilentPush == true ? note.sound = "" : note.sound = "ocy_notification_sound.caf";

    note.payload = {};

    Logger.info("----------------- Sending Push Notification -----------------", pushInfo);

    if (pushInfo.pushMessage != undefined) {
        pushInfo.pushMessage = pushInfo.pushMessage.replace("<b>", "");
        pushInfo.pushMessage = pushInfo.pushMessage.replace("</b>", "");
    }

    if (pushInfo.InappMessage != undefined) {
        pushInfo.InappMessage = pushInfo.InappMessage.replace("<b>", "");
        pushInfo.InappMessage = pushInfo.InappMessage.replace("</b>", "");
    }

    var a = {
        title: pushInfo.pushHeader,
        body: pushInfo.pushMessage
    };

    note.alert = a;

    if (groupType && groupType.type != "privateMessage") {
        note.payload = {
            'notificationId': postDetails.parent_post_id,
            'messageFrom': "Office Curry",
            'type': groupType.type,
            'update': postDetails.last_update,
            'unread_count': unread_count,
            'postId': postDetails.parent_post_id,
        };

        if (groupType.action) note.payload.action = groupType.action;
        if (groupType.related_post) note.payload.related_post = postDetails.parent_post_id;

    } else if (groupType && groupType.type == "privateMessage") {

        note.payload = {
            'notificationId': postDetails.parent_post_id,
            'messageFrom': "Office Curry",
            'pid': postDetails.parent_post_id,
            'type': groupType.type,
            'msgData': groupType.message,
            'user': groupType.originator._id,
            'imgMessage': groupType.image_msg,
            'msg_type': groupType.originator.msg_type,
            'last_update': postDetails.last_update,
            'userImage': groupType.originator.profile_image,
        };
    }

    note.payload.InappMessage = pushInfo.InappMessage;

    apnProvider.send(note, myDevice).then((response) => {
        response.sent.forEach((token) => {
            Logger.info("Notification successfully sent for token: " + token);
        });
        response.failed.forEach((failure) => {
            if (failure.error) {
                // A transport-level error occurred (e.g. network problem)
                Logger.info("Transport level failure: Device: " + failure.device + ", Error: " + failure.error);
            } else {
                // `failure.status` is the HTTP status code
                // `failure.response` is the JSON payload
                Logger.info("Other failure: Device: " + failure.device + ", Status: " + failure.status + ", Response: " + failure.response);
            }
        });
    });

}