Error in a form field

gistfile1.html

<!-- Error in a form field add class error to the field and insert-->
<div class="field error">
  <label>
    Name
    <input name="application[name]" type="text" placeholder="My Cool App" size="20" maxlength="20" value="<%= h @application['name'] %>">
    <small> Required. The name of your application.</small>
  </label>
  <em class="error">This field is required.</em>
</div>