Error while connecting to SQL server through Django - django

Question

In settings file, I have given SQL SERVER Database connection values like this.
DATABASES = {
'default': {
'NAME': 'AdventureWorks2014',
'ENGINE': 'sqlserver_ado',
'HOST': '127.0.0.1',
'USER': '',
'PASSWORD': '',
}
}
Versions:
Django v:1.11
Python v:2.7
django-mssql v:1.8
pip v:9.0
Development Platform:
Visual Studio
After the database connection values changes, I have used the command
python manage.py makemigrations
Here I got the error:
Executing manage.py makemigrations
Traceback (most recent call last):
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\manage.py", line 17, in
execute_from_command_line(sys.argv)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\core\management__init__.py", line 364, in execute_from_command_line
utility.execute()
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\core\management__init__.py", line 338, in execute
django.setup()
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\apps\registry.py", line 108, in populate
app_config.import_models()
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\apps\config.py", line 202, in import_models
self.models_module = import_module(models_module_name)
File "C:\Python27\Lib\importlib__init__.py", line 37, in import_module
import(name)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\contrib\auth\models.py", line 4, in
from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\contrib\auth\base_user.py", line 52, in
class AbstractBaseUser(models.Model):
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\db\models\base.py", line 124, in new
new_class.add_to_class('_meta', Options(meta, app_label))
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\db\models\base.py", line 325, in add_to_class
value.contribute_to_class(cls, name)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\db\models\options.py", line 214, in contribute_to_class
self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\db__init__.py", line 33, in getattr
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\db\utils.py", line 212, in getitem
conn = backend.DatabaseWrapper(db, alias)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\sqlserver_ado\base.py", line 184, in init
super(DatabaseWrapper, self).init(*args, **kwargs)
File "E:\Django Projects\DjangoMSSQLDatabaseConn\DjangoMSSQLDatabaseConn\VirtualEnv\lib\site-packages\django\db\backends\base\base.py", line 96, in init
self.client = self.client_class(self)
TypeError: Error when calling the metaclass bases
'NoneType' object is not callable
The interactive Python process has exited.
Can anyone help me solve this?