VERIFIED SOLUTION i
Date picker throws error "Next run date must be a valid date (format=dd/MMM/yy)" while selecting a date.
The could be caused due to the format of the date on the client machine (on which Visual Dialogue is running) set as 'dd-MMM-yy'.
ResolutionUPDATED: March 28, 2017
Change the date format to other than 'dd-MMM-yy'.