[Python] AttributeError: 'NoneType' object has no attribute 'startswith' while makemigrations...

I am using Django 1.9.13 with python 2.7.5 When i make migrations i get below error. I checked the database settings, all fine working with other app. I couldn't figure out the solution.

I am using mysql DB at the backend. I am using one app that is carried from test environment.

Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/root/projects/misque/lib/python2.7/site-
packages/django/core/management/__init__.py", line 353, in
execute_from_command_line
utility.execute()
File "/root/projects/misque/lib/python2.7/site-p
Packages/django/core/management/__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/root/projects/misque/lib/python2.7/site-
packages/django/core/management/base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "/root/projects/misque/lib/python2.7/site-
packages/django/core/management/base.py", line 398, in execute
self.check()
File "/root/projects/misque/lib/python2.7/site-
packages/django/core/management/base.py", line 426, in check
include_deployment_checks=include_deployment_checks,
File "/root/projects/misque/lib/python2.7/site-
packages/django/core/checks/registry.py", line 75, in run_checks
new_errors = check(app_configs=app_configs)
File "/root/projects/misque/lib/python2.7/site-
packages/django/core/checks/model_checks.py", line 28, in check_all_models
errors.extend(model.check(**kwargs))
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/models/base.py", line 1178, in check
errors.extend(cls._check_fields(**kwargs))
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/models/base.py", line 1255, in _check_fields
errors.extend(field.check(**kwargs))
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/models/fields/__init__.py", line 925, in check
errors = super(AutoField, self).check(**kwargs)
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/models/fields/__init__.py", line 208, in check
errors.extend(self._check_backend_specific_checks(**kwargs))
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/models/fields/__init__.py", line 317, in
_check_backend_specific_checks
return connections[db].validation.check_field(self, **kwargs)
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/mysql/validation.py", line 18, in check_field
field_type = field.db_type(connection)
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/models/fields/__init__.py", line 625, in db_type
return connection.data_types[self.get_internal_type()] % data
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/__init__.py", line 36, in __getattr__
return getattr(connections[DEFAULT_DB_ALIAS], item)
File "/root/projects/misque/lib/python2.7/site-
packages/django/utils/functional.py", line 33, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/mysql/base.py", line 184, in data_types
if self.features.supports_microsecond_precision:
File "/root/projects/misque/lib/python2.7/site-
packages/django/utils/functional.py", line 33, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/mysql/features.py", line 53, in
supports_microsecond_precision
return self.connection.mysql_version >= (5, 6, 4) and Database.version_info
>= (1, 2, 5)
File "/root/projects/misque/lib/python2.7/site-
packages/django/utils/functional.py", line 33, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/mysql/base.py", line 359, in mysql_version
with self.temporary_connection():
File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
return self.gen.next()
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/base/base.py", line 564, in temporary_connection
cursor = self.cursor()
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/base/base.py", line 231, in cursor
cursor = self.make_debug_cursor(self._cursor())
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/base/base.py", line 204, in _cursor
self.ensure_connection()
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/base/base.py", line 199, in ensure_connection
self.connect()
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/base/base.py", line 170, in connect
conn_params = self.get_connection_params()
File "/root/projects/misque/lib/python2.7/site-
packages/django/db/backends/mysql/base.py", line 251, in
get_connection_params
if settings_dict['HOST'].startswith('/'):
AttributeError: 'NoneType' object has no attribute 'startswith'


Mysql DB is working fine and i can see db and tables. App is added in settings.py

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