ConnectionRefusedError in dJango rest api while registration process

ConnectionRefusedError error showing when register user,

basic information added on database but password field was blank and other database fields submitted please find the following error and our class code,

Class

class ProfessionalRegistrationSerializer(serializers.HyperlinkedModelSerializer):

password = serializers.CharField(max_length=20, write_only=True)


email = serializers.EmailField()
first_name = serializers.CharField(max_length=30)
last_name = serializers.CharField(max_length=30)

class Meta:
    model = User

    fields = ('url', 'id', 'first_name', 'last_name', 'email', 'password')

def validate_email(self, value):
    from validate_email_address import validate_email
    if User.all_objects.filter(email=value.lower()).exists():
        raise serializers.ValidationError('User with this email already exists.')

    return value.lower()

def create(self, validated_data):
    password = validated_data.pop('password')
    email = validated_data.pop('email')
    user = User.objects.create(
        username=email.lower(),
        email=email.lower(),
        role_id=1,
        **validated_data)
    user.set_password(password)

    user.save()

    return user

Error

ConnectionRefusedError at /api/v1/register/professional/ [Errno 111] Connection refused Request Method: POST Request URL: http://127.0.0.1:8000/api/v1/register/professional/ Django Version: 1.8.14 Exception Type: ConnectionRefusedError Exception Value:
[Errno 111] Connection refused Exception Location: /usr/lib/python3.5/socket.py in create_connection, line 702 Python Executable: /home/project_backend/env/bin/python Python Version: 3.5.2 Python Path:
['/home/project_backend', '/home/project_backend/env/lib/python35.zip', '/home/project_backend/env/lib/python3.5', '/home/project_backend/env/lib/python3.5/plat-x86_64-linux-gnu', '/home/project_backend/env/lib/python3.5/lib-dynload', '/usr/lib/python3.5', '/usr/lib/python3.5/plat-x86_64-linux-gnu', '/home/project_backend/env/lib/python3.5/site-packages', '/home/project_backend/env/lib/python3.5/site-packages/setuptools-36.0.1-py3.5.egg']

Traceback

File "/home/project_backend/env/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response

132.response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/home/project_backend/env/lib/python3.5/site-packages/django/views/decorators/csrf.py" in wrapped_view 58. return view_func(*args, **kwargs) File "/home/project_backend/env/lib/python3.5/site-packages/django/views/generic/base.py" in view 71. return self.dispatch(request, *args, **kwargs) File "/home/project_backend/env/lib/python3.5/site-packages/rest_framework/views.py" in dispatch 464. response = self.handle_exception(exc) File "/home/project_backend/env/lib/python3.5/site-packages/rest_framework/views.py" in dispatch 461. response = handler(request, *args, **kwargs) File "/home/project_backend/filmup/apps/registrations/views.py" in post 53. user = serializer.save(work_status=user_type) File "/home/project_backend/env/lib/python3.5/site-packages/rest_framework/serializers.py" in save 175. self.instance = self.create(validated_data) File "/home/project_backend/project/apps/registrations/serializers.py" in create 157. **validated_data) File "/home/project_backend/env/lib/python3.5/site-packages/django/db/models/manager.py" in manager_method 127. return getattr(self.get_queryset(), name)(*args, **kwargs) File "/home/project_backend/env/lib/python3.5/site-packages/django/db/models/query.py" in create 348. obj.save(force_insert=True, using=self.db) File "/home/project_backend/project/libs/accounts/models.py" in save 217. super().save(*args, **kwargs) File "/home/project_backend/env/lib/python3.5/site-packages/django/db/models/base.py" in save 734. force_update=force_update, update_fields=update_fields) File "/home/project_backend/env/lib/python3.5/site-packages/django/db/models/base.py" in save_base 771. update_fields=update_fields, raw=raw, using=using) File "/home/project_backend/env/lib/python3.5/site-packages/django/dispatch/dispatcher.py" in send 189. response = receiver(signal=self, sender=sender, **named) File "/home/project_backend/filmup/libs/accounts/signals.py" in create_user_setting 19. create_ejabberd_user(instance) File "/home/project_backend/project/libs/accounts/signals.py" in create_ejabberd_user 11. EjabberdUser.objects.create(username=str(user.id), password=str(token.key)) File "/home/project_backend/project/libs/accounts/models.py" in create 73. ctl.register(user=kwargs['username'], password=kwargs['password']) File "/home/project_backend/project/libs/ejabberdctl.py" in register 54. 'password': password}) File "/home/project_backend/project/libs/ejabberdctl.py" in ctl 32. return fn(self.params, payload) File "/usr/lib/python3.5/xmlrpc/client.py" in call 1092. return self.__send(self.__name, args) File "/usr/lib/python3.5/xmlrpc/client.py" in __request 1432. verbose=self.__verbose File "/usr/lib/python3.5/xmlrpc/client.py" in request 1134. return self.single_request(host, handler, request_body, verbose) File "/usr/lib/python3.5/xmlrpc/client.py" in single_request 1146. http_conn = self.send_request(host, handler, request_body, verbose) File "/usr/lib/python3.5/xmlrpc/client.py" in send_request 1259. self.send_content(connection, request_body) File "/usr/lib/python3.5/xmlrpc/client.py" in send_content 1289. connection.endheaders(request_body) File "/usr/lib/python3.5/http/client.py" in endheaders 1102. self._send_output(message_body) File "/usr/lib/python3.5/http/client.py" in _send_output 934. self.send(msg) File "/usr/lib/python3.5/http/client.py" in send 877. self.connect() File "/usr/lib/python3.5/http/client.py" in connect 849. (self.host,self.port), self.timeout, self.source_address) File "/usr/lib/python3.5/socket.py" in create_connection 711. raise err File "/usr/lib/python3.5/socket.py" in create_connection 702. sock.connect(sa)