seafile 修改本地化文件后 运行了i18h.sh 之后启动seahub失败

以下为报错内容

seafile@ubuntu:~/seafile-server-7.0.5$ ./seahub.sh start-fastcgi

LC_ALL is not set in ENV, set to en_US.UTF-8
Starting seahub (fastcgi) at 127.0.0.1:8000 …
/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/requests/init.py:83: RequestsDependencyWarning: Old version of cryptography ([1, 2, 3]) may cause slowdown.
warnings.warn(warning, RequestsDependencyWarning)
Traceback (most recent call last):
File “/opt/seafile/seafile-server-7.0.5/seahub/manage.py”, line 10, in
execute_from_command_line(sys.argv)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/core/management/init.py”, line 364, in execute_from_command_line
utility.execute()
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/core/management/init.py”, line 338, in execute
django.setup()
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/init.py”, line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/apps/registry.py”, line 108, in populate
app_config.import_models()
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/apps/config.py”, line 202, in import_models
self.models_module = import_module(models_module_name)
File “/usr/lib/python2.7/importlib/init.py”, line 37, in import_module
import(name)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/contrib/auth/models.py”, line 103, in
class Group(models.Model):
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/db/models/base.py”, line 162, in new
new_class.add_to_class(obj_name, obj)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/db/models/base.py”, line 325, in add_to_class
value.contribute_to_class(cls, name)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/db/models/fields/related.py”, line 1648, in contribute_to_class
self.remote_field.through = create_many_to_many_intermediary_model(self, cls)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/db/models/fields/related.py”, line 1104, in create_many_to_many_intermediary_model
‘verbose_name’: (’%(from)s-%(to)s relationship’) % {‘from’: from, ‘to’: to},
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/functional.py”, line 162, in mod
return six.text_type(self) % rhs
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/functional.py”, line 119, in __text_cast
return func(*self.__args, **self.__kw)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/init.py”, line 89, in ugettext
return _trans.ugettext(message)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/trans_real.py”, line 345, in ugettext
return do_translate(message, ‘ugettext’)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/trans_real.py”, line 321, in do_translate
_default = _default or translation(settings.LANGUAGE_CODE)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/trans_real.py”, line 228, in translation
_translations[language] = DjangoTranslation(language)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/trans_real.py”, line 129, in init
self._add_installed_apps_translations()
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/trans_real.py”, line 177, in _add_installed_apps_translations
translation = self._new_gnu_trans(localedir)
File “/opt/seafile/seafile-server-7.0.5/seahub/thirdpart/django/utils/translation/trans_real.py”, line 156, in _new_gnu_trans
fallback=use_null_fallback)
File “/usr/lib/python2.7/gettext.py”, line 496, in translation
t = translations.setdefault(key, class(fp))
File “/usr/lib/python2.7/gettext.py”, line 182, in init
self._parse(fp)
File “/usr/lib/python2.7/gettext.py”, line 318, in _parse
self.plural = c2py(plural)
File “/usr/lib/python2.7/gettext.py”, line 95, in c2py
raise ValueError, ‘plural forms expression could be dangerous’
ValueError: plural forms expression could be dangerous
Error:Seahub failed to start.

请问有什么办法可以解决吗