nodemailer-express-handlebars |错误：ENOENT：模板没有这样的文件或目录！！节点.js

如何解决nodemailer-express-handlebars |错误：ENOENT：模板没有这样的文件或目录！！节点.js

我正在尝试使用 nodemailer 和 express-handlebars 发送一个模板表单节点 js，但我收到错误没有这样的文件我不知道我错过了什么
我正在附上我的 index.js

const express = require('express')

const app = express()
const bodyParser = require('body-parser')
const hb = require('nodemailer-express-handlebars')
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json())
 const nodemailer = require('nodemailer');
 const { google } = require('googleapis');
 const path = require('path');

// These id's and secrets should come from .env file.
 const CLIENT_ID = 'the id';
 const CLEINT_SECRET = 'the secret';
 const REDIRECT_URI = 'uri';
 const REFRESH_TOKEN = 'the token';

 const oauth2client = new google.auth.OAuth2(
   CLIENT_ID,CLEINT_SECRET,REDIRECT_URI
 );
 oauth2client.setCredentials({ refresh_token: REFRESH_TOKEN });



app.post("/api",async (req,res) => {
    try{
    const accesstoken = await oauth2client.getAccesstoken();

    const transport = nodemailer.createTransport({
      service: 'gmail',auth: {
        type: 'OAuth2',user: 'your [enter image description here][1]emial',clientId: CLIENT_ID,clientSecret: CLEINT_SECRET,refreshToken: REFRESH_TOKEN,accesstoken: accesstoken,},})
    
    const handlebarOptions = {
        viewEngine: {
          extName: ".handlebars",partialsDir: path.resolve(__dirname,"emialTemplate"),defaultLayout: false,viewPath: path.resolve(__dirname,extName: ".handlebars",};
      
      transport.use(
        "compile",hb(handlebarOptions)
      );

   // the data which we going to send

    const mailOptions = {
        from: req.body.name + '<ummed.gagrana@gmail.com>',to: 'ummed.gagrana@gmail.com',subject: req.body.subject,text: "From:" + req.body.email + "\n Message:" + req.body.message,//   html: '<h2>From:</h2>'+'<h4>'+req.body.email+"</h4> <br>"+"<h2>Message:</h2>"+'<h4>'+req.body.message+"</h4>",template: 'comeBack'
    };
   //sending mail

       const result = await transport.sendMail(mailOptions);

   // checking the result after sending mail
        console.log(result)
        res.send({hey:"well done you just paased some data"})

      } catch (error) {
        console.log(error)
      }
    
})

app.listen(3000,() => {
    console.log("server up and running on port 3000")
})

这个代码我不确定我缺少什么我是 nodejs 的初学者所以请帮助
我附上我的工作目录路径以获得帮助

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