Error Message When Scheduling

[gizmodoc (DR)]

I just began noticing this error when scheduling patients:

Is this something important? I thought that I had my setting to not show error messages. How do I resolve it?

Thanks

[stephenwaite]

https://www.open-emr.org/wiki/index.php/FAQ#What_are_the_correct_PHP_settings_.28can_be_found_in_the_php.ini_file.29.3F