<form method="post" id="login" action="/login">
 <div class="login-element">
    <label for="email">E-Mail</label>
    <input type="text" name="email">
</div>
<div class="login-element">
    <label for="password">Passwort</label>
    <input type="password"  name="password">
</div>
<div class="login-element">
    <input type="submit" value="Login">
</div>
</form>

这里是我用于验证的代码：

$(document).ready(function() { 
    $("#login").validate({
       debug: true,rules: {
            email: {
              required: true,email: true
            },password: {
              required: true
            }
        },messages: {
            email: {
                required: "Please enter a email adress",email: "Please enter a valid email address"
            },password:"Please enter password"
        }
    });
    });

在控制台中记录以下错误：

TypeError: validator is undefined
...or.settings[eventType] && validator.settings[eventType].call(validator,this[0],...

这里可能是什么问题？