title: How to stop the user is already exist validation in django?
body: <p>I am using django forms. Here is my code,</p>
  
  <pre><code>class LoginForm(forms.ModelForm):
  
      class Meta:
          model = User
          fields = ('username', 'password',)
          help_texts = {
              'username': ''
          }
  </code></pre>
  
  <p>I try to login the page using generated form. When I submit the button with empty values, It's gives "This field is required" validation default and I need this. But when I submit the button with correct username and correct password. It's gave the another validation like "User with this Username already exists." and I don't want this. How to stop particular validation rule in django. Advanced Thanks..</p>