stack trace for babel issue

gistfile1.txt

Traceback (most recent call last):
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/travis/build/flask-admin/flask-admin/flask_admin/base.py", line 68, in inner
    return self._run_view(f, *args, **kwargs)
  File "/home/travis/build/flask-admin/flask-admin/flask_admin/base.py", line 359, in _run_view
    return fn(self, *args, **kwargs)
  File "/home/travis/build/flask-admin/flask-admin/flask_admin/model/base.py", line 1587, in index_view
    actions, actions_confirmation = self.get_actions_list()
  File "/home/travis/build/flask-admin/flask-admin/flask_admin/actions.py", line 89, in get_actions_list
    actions.append((name, text_type(text)))
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/speaklater.py", line 133, in __str__
    return str(self.value)
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/speaklater.py", line 115, in <lambda>
    value = property(lambda x: x._func(*x._args, **x._kwargs))
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask_babelex/__init__.py", line 533, in gettext
    t = self.get_translations()
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask_babelex/__init__.py", line 510, in get_translations
    locale = get_locale()
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask_babelex/__init__.py", line 226, in get_locale
    locale = babel.default_locale
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask_babelex/__init__.py", line 183, in default_locale
    return self.load_locale(self.app.config['BABEL_DEFAULT_LOCALE'])
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/flask_babelex/__init__.py", line 198, in load_locale
    self._locale_cache[locale] = rv = Locale.parse(locale)
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/babel/core.py", line 286, in parse
    language = get_global('language_aliases').get(language, language)
  File "/home/travis/virtualenv/python3.3.5/lib/python3.3/site-packages/babel/core.py", line 58, in get_global
    _global_data = pickle.load(fileobj)
TypeError: an integer is required (got type str)