Emails Not Delivered!

Hello,

I have a problem with emails, all of my emails are listed on (Email Queue) as Not sent,
but when I click on send now from Email Queue I get them successfully

I found this on background jobs

frappe.email.queue.flush

Queue / Worker	Job	Created
failed	
frappe.email.queue.flush
Traceback (most recent call last):
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/rq/worker.py", line 793, in perform_job
    rv = job.perform()
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/rq/job.py", line 599, in perform
    self._result = self._execute()
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/rq/job.py", line 605, in _execute
    return self.func(*self.args, **self.kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/utils/background_jobs.py", line 126, in execute_job
    log(method_name, message=repr(locals()))
  File "/home/frappe/frappe-bench/apps/frappe/frappe/utils/scheduler.py", line 210, in log
    d.insert(ignore_permissions=True)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 215, in insert
    self.run_method("before_insert")
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 774, in run_method
    self.run_notifications(method)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 796, in run_notifications
    filters={'enabled': 1, 'document_type': self.doctype})
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 1281, in get_all
    return get_list(doctype, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 1254, in get_list
    return frappe.model.db_query.DatabaseQuery(doctype).execute(None, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/db_query.py", line 93, in execute
    result = self.build_and_run()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/db_query.py", line 105, in build_and_run
    args = self.prepare_args()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/db_query.py", line 123, in prepare_args
    self.set_optional_columns()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/db_query.py", line 272, in set_optional_columns
    columns = frappe.db.get_table_columns(self.doctype)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/database.py", line 903, in get_table_columns
    return self.get_db_table_columns('tab' + doctype)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/database.py", line 899, in get_db_table_columns
    return [r[0] for r in self.sql("DESC `%s`" % table)]
  File "/home/frappe/frappe-bench/apps/frappe/frappe/database.py", line 210, in sql
    self._cursor.execute(query)
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/cursors.py", line 170, in execute
    result = self._query(query)
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/cursors.py", line 328, in _query
    conn.query(q)
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/connections.py", line 517, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/connections.py", line 732, in _read_query_result
    result.read()
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/connections.py", line 1075, in read
    first_packet = self.connection._read_packet()
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/connections.py", line 684, in _read_packet
    packet.check_error()
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/protocol.py", line 220, in check_error
    err.raise_mysql_exception(self._data)
  File "/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/pymysql/err.py", line 109, in raise_mysql_exception
    raise errorclass(errno, errval)
ProgrammingError: (1146, u"Table '1bd3e0294da19198.tabNotification' doesn't exist")

my version ERPNext: v11.1.13 (master)

solved the problem.

bench --site sitename enable-scheduler