How do I resolve the error "Reminder Day- Invalid Value" when on the Bulk Actions screen?

How do I resolve the error "Reminder Day- Invalid Value" when on the Bulk Actions screen?

This feature is available on the Premier and Master edition

The error "Reminder Day- Invalid Value"  will display as follows.

      

      

      Navigate > Bulk Actions 
 
      

The error will display if the reminder day have been completed as follows instead of a numeric value being entered.

      

Check that the Reminder Day Field have been completed with a numerical number  for example 9 to indicate the 9th of August on the MS Excel Template sheet to indicate on which day the reminder should occur.