I dont know why I am getting the error Cannot read properties of null (reading 'addEventListener') when it is connected properly

hey guys I don't know why I am getting the error Cannot read properties of null (reading 'addEventListener') when it is connected properly. It is super frustrating here is my code any help would be apprecaited

javascript

const formControl = document.getElementById('contact');
const mail = document.getElementById('email');
const errors = document.querySelector('error-messages');

formControl.addEventListener('submit', (e) => {
  if (mail.value === mail.value.toLowerCase()) {
    errors.textContent = '';
  } else {
    e.preventDefault();
    errors.innerHTML = 'the email must be in lowercase letters <br> form not sent';
  }
});

HTML 

 <section id="contactpage" class="form-section">
    <div class="form-container">

      <form action="https://formspree.io/f/myyvzkag" method="post" id="contact">
        <ul class="form-info">
          <li>
            <input
              type="text"
              maxlength="30"
              name="user_name"
              class="name-text-box"
              id="full-name"
              placeholder="Full Name"
              required=""
            />
          </li>

          <li>
            <input
              type="email"
              name="user_email"
              class="name-last-text-box"
              id="email"
              placeholder="Email Address"
              required=""
            />
          </li>
          <li>
            <textarea
              id="text-box"
              name="message"
              maxlength="500"
              class="enter-form"
              cols="30"
              rows="10"
              placeholder="Enter text here"
              required=""
            ></textarea>
          </li>
        </ul>
      </form>
      <input type="submit" value="Get in touch" class="send-btn" />
      <small class="error-messages"></small>

    </div>

I have tried everything I know to fix this error but maybe someone might know how to fix this problem