WordPress form error when I build theme

Hi everyone
I truly grateful to this community for all the support!
I have a question when I build the theme, about form element, the WordPress will show error popup like this:
I wonder how can I fix this.
Thank you so much!

Oops! This page has improperly configured forms. Please contact your website administrator to fix this issue.

My HTML code(this is the webflow export version):

<div data-w-id="13d89fc0-978c-a5d7-5dd8-14091d73373b" class="div-block-40 modal">
  <div class="div-block-41 w-clearfix">
    <a href="#" data-w-id="1e88e741-8e04-a4f0-8cfd-af6dd85518f7" class="link-11">Close X</a>
    <h1 class="heading-19">Sign up for goodies</h1>
    <p class="paragraph-16">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse varius enim in eros elementum tristique. Duis cursus, mi quis viverra ornare, eros dolor interdum nulla, ut commodo diam libero vitae erat. Aenean faucibus nibh et justo cursus
      id rutrum lorem imperdiet. Nunc ut sem vitae risus tristique posuere.</p>
    <div class="w-form">
      <form id="email-form-2" name="email-form-2" data-name="Email Form 2">
        <label for="name-3" class="field-label-7">Name:</label>
        <input type="text" class="w-input" maxlength="256" name="name-2" data-name="Name 2" id="name-2">
        <label for="email-3" class="field-label-8">Email Address:</label>
        <input type="text" class="w-input" maxlength="256" name="email-2" data-name="Email 2" id="email-2" required="">
        <input type="submit" value="JOIN ME" data-wait="Please wait..." class="submit-button-4 w-button">
        <p class="paragraph-16">No Spam, just some good info you would like.</p>
      </form>
      <div class="w-form-done">
        <div>Thank you! Your submission has been received!</div>
      </div>
      <div class="w-form-fail">
        <div>Oops! Something went wrong while submitting the form.</div>
      </div>
    </div>
  </div>
</div>

Thanks!

The page I need help with: [log in to see the link]