Norton Ghost 15.0 Monthy Backup Issue

I backup a drive on the 1st of every month (custom monthly backup).  That works just great, but Ghost begins generating an error as soon as the there has been no backup on the drive for 30 days.  That means that Ghost begins reporting an error with that drives backup on months with more than 30 days.  Status reporting is set for Full Status Reporting. 

 

Does anyone know how to fix this?

 

Thanks!  David