No module named django

[benzid-wael]

I'm trying to install django-nonrel with mongodb support, below installed packages

git+https://github.com/django-nonrel/django@nonrel-1.7
git+https://github.com/django-nonrel/djangotoolbox  # v1.8.0
git+https://github.com/django-nonrel/mongodb-engine  # v0.6.0
pymongo==3.1
mongoadmin==0.2
mongodbforms==0.3
mongoengine==0.10.0

and my settings file is as follow:

INSTALLED_APPS = (
    # 'django.contrib.admin',
    # 'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'djangotoolbox',
)

and for db settings:

DATABASES = {
   'default' : {
      'ENGINE' : 'django_mongodb_engine',
      'NAME' : 'mydb',
      'HOST': 'mongo'
   }
}

When I run manage.py syncdb, I got this error:

NotImplementedError: subclasses of BaseDatabaseIntrospection may require a get_table_list() method

and if I run manage.py without specifying any command, I got:

ImportError: No module named django

However django is installed and the pythonpath is properely configured