How do I resolve the error "Advise which day of the month this reminder should recur" on the Bulk Actions screen?

How do I resolve the error "Advise which day of the month this reminder should recur" on the Bulk Actions screen?

This feature is available on the Premier and Master edition
The error "Advise which day of the month this reminder should recur" will display as follows.

      Navigate > Bulk Actions 

      

       

Verify that the Reminder Day Field have been completed with a numerical number  on the MS Excel Template sheet to indicate on which day the reminder should occur.