在提交表单“ TypeError：无法读取未定义的属性”用户名”时获取此信息

如何解决在提交表单“ TypeError：无法读取未定义的属性”用户名”时获取此信息

这是我提交的表单，上面出现类型错误。输入字段的名称也匹配，我什至不知道在哪里使用Body-Parser有什么问题：

<form action="/signup" method="POST" class="my-2 form">
                <div class="form-group">
                    <label>Username :</label>
                    <input type="text" class="form-control" name="username" autocomplete="off">
                </div>
                <div class="form-group">
                    <label>Email :</label>
                    <input type="email" class="form-control" name="email" placeholder="Enter your Email"
                        autocomplete="off">
                </div>
                <div class="form-group">
                    <label>Password :</label>
                    <input type="password" class="form-control" name="pass">
                </div>
                <div class="form-group">
                    <label>Confirm-Password :</label>
                    <input type="password" class="form-control" name="c_password">
                </div>
                <div class="form-group">
                    <label>Age :</label>
                    <input type="number" class="form-control" name="age">
                </div>
                <div class="row">
                    <div class="col-6 my-1 text-center"><button type="submit" class="btn btn-warning">Sign
                            Up</button></div>
                    <div class="col-6 my-1 text-center"><a href="/login" class="btn btn-secondary">LogIn</a></div>
                </div>
            </form>

我的发布和获取路线是：

    app.use(bodyParser.urlencoded({limit : '10mb',extended : false}))
    const userModeule = require('../model/users');
     router.get('/signup',(req,res) => {
      res.render('signup',{ title: "SignUp Page",msg: ''  })
     })
     router.post('/signup',res) => {
var username = req.body.username;
var email = req.body.email;
var pass = req.body.pass;
var age = req.body.age;

const userDetail = new userModeule({
    username: username,email: email,password:pass,age: age,}) 
userDetail.save((err,doc) => {
    if (err)  throw err
    res.render('signup',{ title: 'Pass Managment'})
})
})

Mongoose Atlas connecton正在工作，Mongoose Schema是这样的：

const userSchema = new mongoose.Schema({
username : {
    type : String,required : true,index :{
        unique:true
    }
},email : {
    type : String,index : {
        unique:true
    }
},password : {
    type : String,},age : {
    type : Number,date:{
    type: Date,default: Date.now    
},})
//==============Creating schema model to export
 const userModel = mongoose.model('user',userSchema);
  module.exports = userModel

这是我得到的错误：

“ TypeError：无法读取未定义的属性'用户名'”