Typically that points to an error in the start and end times for the setup. Set the start time to 00:01am and end time 11:59pm
Are you sure the task can finish inside 1 minute? Otherwise you may be overloading the server. Make sure to set a force abort time.
Setting the start time to 12:01 a.m. and the end time to 11:59 p.m. did the trick. Not sure what the two-minute padding there has do to with it, but whatever works!
The task takes very little time, and I'm using locks to handle any case where multiple schedules might run simultaneously.