关于python：为什么这段代码会产生这个错误？

Why this code piece is producing this error?

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# -*- coding: utf-8 -*-
from __future__ import print_function
import io
import os
from os.path import dirname, join

from alembic import command
from alembic.config import Config
import baker

from webapp.database import db
from webapp.main import app
import webapp.areas.manage
import webapp.users.manage
import webapp.planner.manage
import webapp.tests.manage

@baker.command
def load_data():

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traceback (most recent call last):
File"manage.py", line 11, in
from webapp.database import db
File"/var/www/project01/webapp/database/__init__.py", line 3, in
from .main import db
File"/var/www/project01/webapp/database/main.py", line 6, in
from ..app import app
File"/var/www/project01/webapp/app.py", line 37, in
default_timezone="America/Lima"
File"/usr/local/lib/python2.7/dist-packages/allspeak/allspeak.py", line 30, in __init__
super(Allspeak, self).__init__(*args, **kwargs)
File"/usr/local/lib/python2.7/dist-packages/allspeak/i18n.py", line 33, in __init__
self.load_translations()
File"/usr/local/lib/python2.7/dist-packages/allspeak/i18n.py", line 50, in load_translations
self.translations = self.reader.load_translations(locales=locales)
File"/usr/local/lib/python2.7/dist-packages/allspeak/reader.py", line 129, in load_translations
self._update_translations(translations, filepath)
File"/usr/local/lib/python2.7/dist-packages/allspeak/reader.py", line 96, in _update_translations
data = self._load_file(filepath)
File"/usr/local/lib/python2.7/dist-packages/allspeak/reader.py", line 90, in _load_file
return self._extract_locales(data)
File"/usr/local/lib/python2.7/dist-packages/allspeak/reader.py", line 81, in _extract_locales
for locale, trans in data.items()
AttributeError: 'NoneType' object has no attribute 'items'