Error: Invalid Frontmatter

Path: /home/.sites/873/site995/web/new/user/pages/11.Kontakt/form.en.md

Failed to read /home/.sites/873/site995/web/new/user/pages/11.Kontakt/form.en.md: Indentation problem at line 39 (near " agree_to_terms:").

---
title: Kontakt

form:
    name: kontakt

    fields:
        firstname:
          label: First name
          placeholder: Enter your first name
          autocomplete: on
          type: text
          validate:
            required: true

        surname:
          label: Surname
          placeholder: Enter your Surname
          autocomplete: on
          type: text
          validate:
            required: true

        email:
          label: Email
          placeholder: Enter your email address
          type: email
          validate:
            required: true

        message:
          label: Message
          placeholder: Enter your message
          type: textarea
          minlength: 10
          maxlength: 510
          validate:
            required: true

       agree_to_terms:
         type: checkbox
         label: "Agree to the terms and conditions"
         validate:
           required: true

        basic-captcha:
          type: basic-captcha
          placeholder: copy the 6 characters
          label: Are you human?

    buttons:
        submit:
          type: submit
          value: Submit
        reset:
          type: reset
          value: Reset

    process:
        basic-captcha: true
        save:
            fileprefix: contact-
            dateformat: Ymd-His-u
            extension: txt
            body: "{% include 'forms/data.txt.twig' %}"
        email:
            from: "{{ config.plugins.email.from }}"
            to:
              - "{{ config.plugins.email.from }}"
              - "{{ form.value.email }}"
            subject: "[Site Contact Form] {{ form.value.name|e }}"
            body: "{% include 'forms/data.html.twig' %}"
        message: Thank you for getting in touch!
        display: thankyou
---

#  Contact form

The privacy policy is missing.