正确的用户名密码未登录django

我正在使用django开发一个小型网站，并且正在使用内置的登录视图。当我注册一个标准用户，然后尝试使用正确的凭据登录时，它向我显示登录错误“请输入正确的用户名和密码”。我创建的超级用户不会发生此问题。可以使用正确的凭据登录，而不会显示任何错误消息。

这是我的注册视图的views.py。

from django.shortcuts import redirect, render, get_object_or_404
from django.contrib.auth.models import User
from .forms import UserForm

def register_user(request):
    if request.method == "POST":
        form = UserForm(request.POST)
        if form.is_valid():
            user = form.save()
            return redirect('user_profile', pk=user.pk)
    else:
        form = UserForm()
    return render(request, 'interport/register_user.html', {'form':form})

admin.py：

from django.contrib import admin
from django.contrib.auth.models import User

forms.py：

from django import forms
from django.contrib.auth.models import User

class UserForm(forms.ModelForm):
    class Meta:
    model = User
    fields = ('first_name', 'last_name', 'email', 'username', 'password',)

urls.py：

from django.conf.urls import url
from django.contrib.auth import views as auth_views
from . import views

urlpatterns = [
    url(r'^accounts/login/$', auth_views.login, name='login'),
    url(r'^logout/$', auth_views.logout, {'next_page': '/'}, name='logout'),
    url(r'^register_user$', views.register_user, name='register_user'),
    url(r'^$', views.home, name='home'),
]

登录模板：

{% extends "interport/base.html" %}
{% block content %}
<div class="container">
  <div class="row">
    <div class="center col s4 offset-s4 card-panel #fff8e1 amber lighten-5">
<h2>Login</h2>
<form method="post">
{% csrf_token %}
{{ form.as_p }}
<button type="submit">Login</button>
</form>
    </div>
  </div>
</div>
{% endblock %}