apscheduler error

Fri Jan 7 20:08:28 EST 2011

I tried to use the apscheduler and used the sample code below from the
tutorial, but got the error message: Exception in thread APScheduler
(most likely raised during interpreter shutdown). What's going on
here? I really appreciate any help!
from apscheduler.scheduler import Scheduler
sched = Scheduler()
sched.start()
def some_job():
 print "Decorated job"
sched.add_interval_job(some_job,minutes=1)