how to pass a custom form to django.contrib.auth.views.login

I am trying to pass a custom template and form to auth.views.login. I am getting the error message. What is wrong with this?

in views.py,

def login_user(request, template_name='login.html', 
           redirect_field_name = None, 
           authentication_form = BootstrapAuthenticationForm,
           extra_context=None):
response = auth.views.login(request, template_name, redirect_field_name, authentication_form)