"'str' does not support the buffer interface" in serverHashFunction() about python-memcached

[MakersF]

I'd like to had this location as well

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f00537e9f28>
Traceback (most recent call last):
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/autoreload.py", line 229, in wrapper
    fn(*args, **kwargs)
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/core/management/commands/runserver.py", line 107, in inner_run
    autoreload.raise_last_exception()
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/autoreload.py", line 252, in raise_last_exception
    six.reraise(*_exception)
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/six.py", line 658, in reraise
    raise value.with_traceback(tb)
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/autoreload.py", line 229, in wrapper
    fn(*args, **kwargs)
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/apps/registry.py", line 115, in populate
    app_config.ready()
  File "/media/francesco/A6528DA1528D76B9/Programmazione/Python/Spark/team_comp_site/teamcomp/apps.py", line 19, in ready
    client.get_stats()
  File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/memcache.py", line 338, in get_stats
    stats = line.split(' ', 2)
TypeError: 'str' does not support the buffer interface