问安装jumpserver报错了，求教大神？

Traceback (most recent call last):

File "/home/jack/Downloads/jumpserver/install/next.py", line 107, in <module>

setup.start()

File "/home/jack/Downloads/jumpserver/install/next.py", line 98, in start

self._sync_db()

File "/home/jack/Downloads/jumpserver/install/next.py", line 73, in _sync_db

execute_from_command_line(['manage.py', 'syncdb', '--noinput'])

File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line

utility.execute()

File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 392, in execute

self.fetch_command(subcommand).run_from_argv(self.argv)

File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv

self.execute(*args, **options.__dict__)

File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 280, in execute

translation.activate('en-us')

File "/usr/lib/python2.7/site-packages/django/utils/translation/__init__.py", line 130, in activate

return _trans.activate(language)

File "/usr/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 188, in activate

_active.value = translation(language)

File "/usr/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 177, in translation

default_translation = _fetch(settings.LANGUAGE_CODE)

File "/usr/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 159, in _fetch

app = import_module(appname)

File "/usr/lib/python2.7/site-packages/django/utils/importlib.py", line 40, in import_module

__import__(name)

ImportError: No module named django_crontab