[Python] 'ellipsis' object has no attribute 'lower' - When I run python3 manage.py runserver

I am running a web application(wagtail cms) on linux ubuntu. I am getting this error when I run python3 manage.py runserver 0.0.0.0:8000 Please see the error message on the console.

Performing system checks...

System check identified no issues (0 silenced).
March 22, 2018 - 15:27:33
Django version 1.11.1, using settings 'ntdl.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
Internal Server Error: /
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-
packages/django/core/handlers/exception.py", line 41, in inner
response = get_response(request)
File "/usr/local/lib/python3.6/dist-packages/django/utils/deprecation.py",
line 138, in __call__
response = self.process_request(request)
File "/usr/local/lib/python3.6/dist-
packages/django/middleware/security.py", line 25, in process_request
host = self.redirect_host or request.get_host()
File "/usr/local/lib/python3.6/dist-packages/django/http/request.py", line
105, in get_host
if domain and validate_host(domain, allowed_hosts):
File "/usr/local/lib/python3.6/dist-packages/django/http/request.py", line
579, in validate_host
if pattern == '*' or is_same_domain(host, pattern):
File "/usr/local/lib/python3.6/dist-packages/django/utils/http.py", line
291, in is_same_domain
pattern = pattern.lower()
AttributeError: 'ellipsis' object has no attribute 'lower'
"GET / HTTP/1.1" 500 11959
Internal Server Error: /favicon.ico
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-
packages/django/core/handlers/exception.py", line 41, in inner
response = get_response(request)
File "/usr/local/lib/python3.6/dist-packages/django/utils/deprecation.py",
line 138, in __call__
response = self.process_request(request)
File "/usr/local/lib/python3.6/dist-
packages/django/middleware/security.py", line 25, in process_request
host = self.redirect_host or request.get_host()
File "/usr/local/lib/python3.6/dist-packages/django/http/request.py", line
105, in get_host
if domain and validate_host(domain, allowed_hosts):
File "/usr/local/lib/python3.6/dist-packages/django/http/request.py", line
579, in validate_host
if pattern == '*' or is_same_domain(host, pattern):
File "/usr/local/lib/python3.6/dist-packages/django/utils/http.py", line
291, in is_same_domain
pattern = pattern.lower()
AttributeError: 'ellipsis' object has no attribute 'lower'
"GET /favicon.ico HTTP/1.1" 500 11965


I had gone inside the http.py checked the code it has code below

def is_same_domain(host, pattern):
"""
Return ``True`` if the host is either an exact match or a match
to the wildcard pattern.

Any pattern beginning with a period matches a domain and all of its
subdomains. (e.g. ``.example.com`` matches ``example.com`` and
``foo.example.com``). Anything else is an exact string match.
"""
if not pattern:
return False

pattern = pattern.lower()
return (
pattern[0] == '.' and (host.endswith(pattern) or host == pattern[1:])
or
pattern == host
)


I am not able see any errors here. Please help me in fixing this error.

With Many Thanks,

Bharath AK

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