PyFolio ValueError at / cannot use LOCALE flag with a str pattern

After starting the server with python manage.py runserver

I try to open the website by using http://127.0.0.1:8000/

However, I then get the following errors:

Environment:

Request Method: GET
Request URL: http://127.0.0.1:8000/

Django Version: 1.8.4
Python Version: 3.6.3
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'LoginFolio',
 'StockFolio',
 'compressor',
 'django.contrib.humanize']
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File "C:\ProgramData\Anaconda3\lib\site-packages\django\core\handlers\base.py" in get_response
  119.                 resolver_match = resolver.resolve(request.path_info)
File "C:\ProgramData\Anaconda3\lib\site-packages\django\core\urlresolvers.py" in resolve
  366.             for pattern in self.url_patterns:
File "C:\ProgramData\Anaconda3\lib\site-packages\django\core\urlresolvers.py" in url_patterns
  402.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "C:\ProgramData\Anaconda3\lib\site-packages\django\core\urlresolvers.py" in urlconf_module
  396.             self._urlconf_module = import_module(self.urlconf_name)
File "C:\ProgramData\Anaconda3\lib\importlib\__init__.py" in import_module
  126.     return _bootstrap._gcd_import(name[level:], package, level)
File "C:\ProgramData\Anaconda3\Lib\site-packages\PyFolio\PyFolio\urls.py" in <module>
  19. from StockFolio import urls as StockFolio_urls
File "C:\ProgramData\Anaconda3\Lib\site-packages\PyFolio\StockFolio\urls.py" in <module>
  3. from . import views as StockFolio_views
File "C:\ProgramData\Anaconda3\Lib\site-packages\PyFolio\StockFolio\views.py" in <module>
  8. import xlwt
File "C:\ProgramData\Anaconda3\lib\site-packages\xlwt\__init__.py" in <module>
  4. from .Worksheet import Worksheet
File "C:\ProgramData\Anaconda3\lib\site-packages\xlwt\Worksheet.py" in <module>
  38. from .Row import Row
File "C:\ProgramData\Anaconda3\lib\site-packages\xlwt\Row.py" in <module>
  7. from . import ExcelFormula
File "C:\ProgramData\Anaconda3\lib\site-packages\xlwt\ExcelFormula.py" in <module>
  3. from . import ExcelFormulaParser, ExcelFormulaLexer
File "C:\ProgramData\Anaconda3\lib\site-packages\xlwt\ExcelFormulaLexer.py" in <module>
  53.     VERBOSE+LOCALE+IGNORECASE)
File "C:\ProgramData\Anaconda3\lib\re.py" in compile
  233.     return _compile(pattern, flags)
File "C:\ProgramData\Anaconda3\lib\re.py" in _compile
  301.     p = sre_compile.compile(pattern, flags)
File "C:\ProgramData\Anaconda3\lib\sre_compile.py" in compile
  562.         p = sre_parse.parse(p, flags)
File "C:\ProgramData\Anaconda3\lib\sre_parse.py" in parse
  865.     p.pattern.flags = fix_flags(str, p.pattern.flags)
File "C:\ProgramData\Anaconda3\lib\sre_parse.py" in fix_flags
  832.             raise ValueError("cannot use LOCALE flag with a str pattern")

Exception Type: ValueError at /
Exception Value: cannot use LOCALE flag with a str pattern