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Receiving the following warning message from APScheduler v3.5.3 and I cannot find the cause.

WARNING:apscheduler.scheduler:Error getting due jobs from job store 'default': descriptor 'date' requires a 'datetime.datetime' object but received a 'int'

The program in which I have this problem was originally written for Python 2.7 and is currently being rewritten for Python 3.5

After I enabled logging for APScheduler, I can see the job being added to the job store named 'default'.

INFO:apscheduler.scheduler:Scheduler started
DEBUG:apscheduler.scheduler:Looking for jobs to run
DEBUG:apscheduler.scheduler:No jobs; waiting until a job is added
INFO:apscheduler.scheduler:Added job "Notifier.gather" to job store "default"
DEBUG:apscheduler.scheduler:Looking for jobs to run
DEBUG:apscheduler.scheduler:Next wakeup is due at 2018-11-11 18:33:32.954753-05:00 (in 29.996986 seconds)

About 30 seconds later, these messages are displayed. They repeat every 10 seconds instead of the 30 seconds I expected.

DEBUG:apscheduler.scheduler:Looking for jobs to run
WARNING:apscheduler.scheduler:Error getting due jobs from job store 'default': descriptor 'date' requires a 'datetime.datetime' object but received a 'int'
DEBUG:apscheduler.scheduler:Next wakeup is due at 2018-11-11 18:33:42.956582-05:00 (in 10.000000 seconds)

The code I use to set the job(s) and start APScheduler.

import atexit
from apscheduler.schedulers.background import BackgroundScheduler

class Notifier(object):

 class NotificationClient(object):

 def __init__(self, gather, timestamp):
 self.gather = gather
 self.timestamp = timestamp

 def run(self):
 self.timestamp = self.gather(self.timestamp)

 def __init__(self):
 self._logger = logging.getLogger(__name__)
 self.notifiers = 

 # Add the jobs here
 self.notifiers.append(self.NotificationClient(self.checkEmails, None))

 # Start the scheduler
 sched = BackgroundScheduler(timezone="America/New_York", daemon=True)
 sched.start()
 sched.add_job(self.gather, 'interval', seconds=30)

 # Shuts down the scheduler when the main program exits
 atexit.register(lambda: sched.shutdown(wait=False))

 def gather(self):
 # client.run() comes from the NotificationClient() class above
 [client.run() for client in self.notifiers]

 #####
 # The function listed in self.notifiers.append()
 def checkEmails(self, lastRun):

 ...code that counts unread emails...

 return lastRun

# Start APScheduler
notifier = Notifier()