title: How to solve error raised : No module named 'django.contrib.customuser'
body: <p>I am new to Django, trying to create a custom user for my project. When I am running the server, it raises No module named 'django.contrib.customuser' and sometimes, Manager isn't available; auth.User has been swapped for Mysite.CustomUser. Even i changed my settings: django.contrib.auth to django.contrib.custommuser. Please someone help me solving this. Here's my code</p>
  
  <h3>models.py:</h3>
  
  <pre><code>from datetime import datetime
  from django.db import models
  from django.contrib.auth.models import User, BaseUserManager, AbstractUser,   AbstractBaseUser
  
  from django.utils.translation import ugettext_lazy as _
  
  class CustomUserManager(BaseUserManager):
  
      def _create_user(self, username, email, u, password, is_staff, is_active, **extra_fields):
          now = datetime.now()
          if not email:
              raise ValueError('Users must have an email address')
          email = self.normalize_email(email)
          user = self.model(username=username, email=email, u=u, password=password,
               is_staff=is_staff, is_active=False, last_login=now, date_joined=now, **extra_fields)
  
          user.set_password(password)
          user.save(using=self._db)
          return user
  
      def create_user(self, username, email, u, password = None, **extra_fields):
          return self._create_user(username, email, u, False, False, **extra_fields)
  
      def create_superuser(self, username, email, u, password = None):
          user = self._create_user(username, email, u, password, True, True)
  
          user.set_password(password)
          user.is_active=True
          user.is_admin = True
  
          user.is_superuser = True
          user.save(using=self._db) 
          return user
  
  
  
  class CustomUser(AbstractBaseUser):
      username = models.CharField(max_length=30)
      email = models.EmailField(max_length=30, unique=True, db_index=True)
      password1 = models.CharField(max_length=30)
      password2 = models.CharField(max_length=30)
      CHOICES= (('LinkedinUser', 'LinkedinUser'),('FacebookUser', 'FacebookUser'),)
      u = models.CharField(choices=CHOICES, max_length=20, default=0)
      date_joined  = models.DateTimeField(_('date joined'), default=datetime.now)
      is_active    = models.BooleanField(default=True)
      is_admin     = models.BooleanField(default=False)
      is_staff     = models.BooleanField(default=False)
      is_superuser = models.BooleanField(default=False)
      REQUIRED_FIELDS = ('username', 'u')
      USERNAME_FIELD = 'email'
      objects = CustomUserManager()
  
      class Meta:
          verbose_name = _('user')
          verbose_name_plural = _('users')  
  
      def get_full_name(self):
          # The user is identified by their email address
          return self.email
  
      def get_short_name(self):
          # The user is identified by their email address
          return self.email
  
      def __str__(self):              # __unicode__ on Python 2
          return self.email
  
      def has_perm(self, perm, obj=None):
          "Does the user have a specific permission?"
          # Simplest possible answer: Yes, always
          return True
  
      def has_module_perms(self, app_label):
          "Does the user have permissions to view the app `app_label`?"
          # Simplest possible answer: Yes, always
          return True
  
      @property
      def is_staff(self):
          return self.is_admin
  </code></pre>
  
  <h3>forms.py</h3>
  
  <pre><code>from django import forms
  from django.contrib.auth.forms import UserChangeForm, UserCreationForm
  
  from .models import CustomUser#, LinkedInUser, FacebookUser
  import re
  from django.contrib.auth.models import User
  from django.utils.translation import ugettext_lazy as _
  from django.contrib.auth import get_user_model
  
  
  class CustomUserForm(forms.ModelForm):
  
      username = forms.RegexField(regex=r'^\w+$', widget=forms.TextInput(attrs=dict(required=True, max_length=30)), label=_("username"), error_messages={ 'invalid': _("This value must contain only letters, numbers and underscores.") })
      email = forms.EmailField(widget=forms.TextInput(attrs=dict(required=True, max_length=30)), label=_("Email address"))
      password1 = forms.CharField(widget=forms.PasswordInput(attrs=dict(required=True, max_length=30, render_value=False)), label=_("Password"))
      password2 = forms.CharField(widget=forms.PasswordInput(attrs=dict(required=True, max_length=30, render_value=False)), label=_("Password (again)"))
      CHOICES= (('LinkedinUser', 'LinkedinUser'),('FacebookUser', 'FacebookUser'),)
      u = forms.ChoiceField(choices=CHOICES, label='ID', widget=forms.RadioSelect()) 
  
      class Meta :
          model = CustomUser
          fields = [ 'username', 'email', 'password1', 'password2', 'u' ]
  
          User = get_user_model()
  
      def clean_name(self):
          try:
              user = User.objects.get(username__iexact=self.cleaned_data['username'])
          except User.DoesNotExist:
              return self.cleaned_data['username']
          raise forms.ValidationError(_("The username already exists. Please try another one."))
  
      def clean(self):
          if 'password1' in self.cleaned_data and 'password2' in self.cleaned_data:
              if self.cleaned_data['password1'] != self.cleaned_data['password2']:
                  raise forms.ValidationError(_("The two password fields did not match."))
          return self.cleaned_data
  
  
  class CustomUserCreationForm(UserCreationForm):
      """
      A form that creates a user, with no privileges, from the given email and
      password.
      """
  
      def __init__(self, *args, **kargs):
          super(CustomUserCreationForm, self).__init__(*args, **kargs)
          del self.fields['username']
  
      class Meta:
          model = CustomUser
          fields = ("email",)    
  </code></pre>
  
  <h3>admin.py</h3>
  
  <pre><code>from django.contrib import admin
  from django.contrib.auth.admin import UserAdmin
  from django.utils.translation import ugettext_lazy as _
  from django.contrib.auth import get_user_model
  
  from .models import CustomUser
  from .forms import CustomUserCreationForm
  
  class CustomUserAdmin(admin.ModelAdmin):
      form = CustomUserCreationForm
  
  admin.site.register(CustomUser, CustomUserAdmin)
  </code></pre>
  
  <h3>backends.py:</h3>
  
  <pre><code>from models import CustomUser
  
  class CustomUserAuth(object):
  
      def authenticate(self, username=None, password=None):
          try:
              user = CustomUser.objects.get(email=username)
              if user.check_password(password):
                  return user
          except CustomUser.DoesNotExist:
              return None
  
      def get_user(self, user_id):
          try:
              user = CustomUser.objects.get(pk=user_id)
              if user.is_active:
                  return user
              return None
          except CustomUser.DoesNotExist:
              return None
  </code></pre>