Failed to schedule the indicated programs

Problem applying changes on the
Schedule
tab of the
Task Properties
dialog box. The error message indicates one of these conditions:
One of the programs is scheduled under a different task.
Tried to schedule a program that is already scheduled under a different task. Remove the program from the other task schedule.
One of the programs has been deleted.
Tried to schedule a program that was deleted. Recreate the program or choose another program to schedule.
Standard program <program name> can only be scheduled in a standard task.
Tried to schedule a standard program in a Safety task. Standard programs can only be scheduled in standard tasks.
Safety program <program name> can only be scheduled in a Safety task.
Tried to schedule a Safety program in a standard task. Safety programs can only be scheduled in Safety tasks.
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Normal