Invalid day of week or month '%1' for event '%2'

Item Value
SQLCODE -791
Constant SQLE_INVALID_EVENT_DAY
SQLSTATE WE005
Sybase error code 13801
ODBC 2 State ERROR
ODBC 3 State ERROR
Parameter 1 Day-of-week name or day-of-month number.
Parameter 2 Name of the event being scheduled.

Probable cause 

You have attempted to create a schedule with an invalid day-of-week name or day-of-month number.