Hello Daniel,
I think Chad may have responded to you through email, but in case he hasn't here is the solution:
You might need to add it in manually because DotNetNuke starting in 5.4 I believe changed the layout of the schedule table and its not getting added during install.
Please try running this under Host/SQL:
INSERT INTO {objectQualifier}Schedule
(TypeFullName, TimeLapse, TimeLapseMeasurement, RetryTimeLapse, RetryTimeLapseMeasurement, RetainHistoryNum, AttachToEvent,
CatchUpEnabled, Enabled,ObjectDependencies)
VALUES ('DataSprings.DNN.RoleReminder.RoleReminderSchedulerClient,DataSprings.DNN.RoleReminder', 10, 'd', 1, 'h', 500, '', 0, 1,'')
If you have any questions please let me know.
Thanks,
Ryan