user authentication problem

Hello.
I want to register users.
So I made a RegisterForm(ModelForm):
Class Meta:
model=User (from django.auten.contrib.User)

no i display that form in a view and submit it.
When i do form.is_valid(), i get this validation error: Your username
and password didn't match. Please try again.

Does anyone know what can cause this?
i'm included the ModelForm, the view that processes the registration
form and the template that displays the registration form.
Thank you for your time and kind concern.

MY MODEL FORM
class RegisterForm(ModelForm):
class Meta:
model=User

THE VIEW THAT HANDLES THE REGISTRATION
def register(request):
if request.method=='POST':
form=RegisterForm(request.POST)
if form.is_valid(): # HERE I GET A VALIDATION ERROR

new_user=User.objects.create_user(username=form.cleaned_data['username'],

password=form.cleaned_data['password'],

email=form.cleaned_data['email'],
)
new_user.is_active=True
new_user.first_name=form.cleaned_data['first_name']
new_user.last_name=form.cleaned_data['lastname']
return
HttpResponseRedirect(reverse('confirm_registered'),args=[form.cleaned_data['username']])
else:
return render(request,'login/register.html',{'form':form})
else:
raise ValueError()

THE REGISTRATION TEMPLATE

{% extends "store/index2.html" %}

{% block canvas %}
<h3>Registration</h3>

{% if form.errors %}
<p>Your username and password didn't match. Please try again.</p>
{% endif %}

<form method="post" action="/retailstore/login/register.html">
{% csrf_token %}
<table>
<tr>
<td>{{ form.username.label_tag }}</td>
<td>{{ form.username }}</td>
</tr>
<tr>
<td>{{ form.password.label_tag }}</td>
<td>{{ form.password }}</td>
</tr>
<tr>
<td>{{ form.first_name.label_tag }}</td>
<td>{{ form.first_name }}</td>
</tr>
<tr>
<td>{{ form.last_name.label_tag }}</td>
<td>{{ form.last_name }}</td>
</tr>
<tr>
<td>{{ form.email.label_tag }}</td>
<td>{{ form.email }}</td>
</tr>

</table>

<input type="submit" value="register" />
<input type="hidden" name="next" value="{{ next }}" />
</form>
{% endblock %}

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