"unable to determine valid execution date from repeat interval"
*Cause: The specified repeat interval contained conflicting clauses that
made it impossible to ever find a matching date, e.g.,
the scheduler reached its maximum number of attempts to try to
find a valid execution date. This occurs when theoretically
there is a valid execution date far in the future, but the
scheduler took too many attempts to determine this date.
*Action: Remove the conflicting clauses, or simplify the repeat interval
so that it is easier to determine the next execution date.