TypeError: Cannot read property 'padEnd' of undefined

I customize a node as following:


module.exports = function(RED) {
    "use strict";
    const request = require("request");

    function CustomDMRequestNode(config) {
        const url = config.url, datasource = config.datasource ? config.datasource : '';

        this.on('input', function(msg) {
            const options = {
                url: `${url}/service/getData/${datasource}`, 
                body: msg.payload

            if(config.credentials.user && config.credentials.password) {
                options.headers = {
                    "Authorization": "Basic " + Buffer.from(`${config.credentials.user}:${config.credentials.password}`).toString("base64")
            request.post(options, (error, response, body) => {
                    "response": response,
                    "body": body,
                    "error": error
    RED.nodes.registerType("atune dmrequest", CustomDMRequestNode);


<script type="text/x-red" data-template-name="atune dmrequest">
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> <span>Name</span></label>
        <input type="text" id="node-input-name" placeholder="Name" />
    <div class="form-row">
        <label for="node-input-url"><i class="fa fa-globe"></i> <span>Base URL</span></label>
        <input id="node-input-url" type="text" placeholder="http://">
    <div class="form-row">
        <label for="node-input-datasource"><i class="fa fa-tag"></i> <span>Data Soruce</span></label>
        <input type="text" id="node-input-datasource" placeholder="Data Soruce" />
    <div class="form-row">
        <input type="checkbox" id="node-input-useAuth" style="display: inline-block; width: auto; vertical-align: top;">
        <label for="node-input-useAuth" style="width: 70%;"><span>Use Authentication</span></label>
        <div style="margin-left: 20px" class="node-input-useAuth-row hide">
            <div class="form-row node-input-basic-row">
                <label for="node-input-user"><i class="fa fa-user"></i> <span>User Name</span></label>
                <input type="text" id="node-input-user">
            <div class="form-row">
                <label for="node-input-password"> <i class="fa fa-lock"></i> <span>Password</span></label>
                <input type="password" id="node-input-password">

<script type="text/x-red" data-help-name="atune dmrequest">
    <p>A dmrequest block to retrieve data from DataManager.</p>
    <p>The message can provide the payload in <code>msg.payload</code>.</p>
    <p>The block requires some infos:</p>
        <li><code>Base URL</code>: the base url to connect request to DataManager</li>
        <li><code>Data Source</code>: the endpoint to the base url</li>
        <li><code>Basic Authentication</code>: the basic authentication (if required)</li>
    <p>The block will make a request to DataManager and forward the response onto next node in the flow.</p>

<script type="text/javascript">
    RED.nodes.registerType('atune dmrequest',{
        category: 'atune',
        defaults: {
            name: {value:""},
            datasource: {value: ""},
            url: {
                validate:function(v) { 
                    return (v.trim().length === 0) || (v.indexOf("://") === -1) || (v.trim().indexOf("http") === 0)
            //authType: {value: ""},
            senderr: {value: false}
        credentials: {
            user: {type:"text"},
            password: {type: "password"}
        label: function() {
            return this.name;
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        oneditprepare: function() {
            $("#node-input-useAuth").on("change", function() {
                if ($(this).is(":checked")) {
                } else {

Everytime the node is created, the following error occurs:

TypeError: Cannot read property 'padEnd' of undefined
    at Flow.start (C:\Users\tng\AppData\Roaming\npm\node_modules\node-red\node_modules\@node-red\runtime\lib\flows\Flow.js:254:62)
    at start (C:\Users\tng\AppData\Roaming\npm\node_modules\node-red\node_modules\@node-red\runtime\lib\flows\index.js:371:33)

From the error trace log, the error was caused by Flow.js line 254 and it indicates that my customized node seems to have no type. But it is not because i can find the node type information inside flow.json

        "id": "e695cbbf7c54f4ca",
        "type": "atune dmrequest",
        "z": "a77111eb3de2b228",
        "name": "",
        "datasource": "",
        "url": "",
        "senderr": false,
        "x": 400,
        "y": 120,
        "wires": [

I spent like nearly 2 hours to find the issue inside the code, but it doesn't seem to have any problem. May some one know what causes the error ?

nevermind, i forgot to create the node with given config. Issue resolved