django.request:135 handle_uncaught_exception Internal Server Error

The error log is as follows:
[ERROR] django.request:135 handle_uncaught_exception Internal Server Error: /
Traceback (most recent call last):
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/thirdpart/django/core/handlers/exception.py”, line 41, in inner
response = get_response(request)
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/thirdpart/django/core/handlers/base.py”, line 244, in _legacy_get_response
response = middleware_method(request)
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/seahub/base/middleware.py”, line 69, in process_request
self.get_from_db()
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/seahub/base/middleware.py”, line 53, in get_from_db
refresh_cache()
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/seahub/notifications/utils.py”, line 11, in refresh_cache
NOTIFICATION_CACHE_TIMEOUT)
File “/usr/lib/python2.7/site-packages/django_pylibmc/memcached.py”, line 140, in set
**COMPRESS_KWARGS)
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/thirdpart/django/db/models/query.py”, line 202, in getstate
self._fetch_all()
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/thirdpart/django/db/models/query.py”, line 1118, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/thirdpart/django/db/models/query.py”, line 53, in iter
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
File “/niub/seafile/seafile-pro-server-6.3.9/seahub/thirdpart/django/db/models/sql/compiler.py”, line 899, in execute_sql
raise original_exception
ProgrammingError: (1146, “Table ‘seahub_db.notifications_notification’ doesn’t exist”)
Please take a look at this problem!