Using Calendar error

I get this error on calendar every time I schedule a practitioner.
Warning: A non-numeric value encountered in F:\wamp64\www\openemr\library\patient.inc on line 1499
Can Anyone help me please???

maybe your display_errors is On?

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

Thank you all,
I just corrected the problem with the instruction:
$ dobYear = (int) substr ($ dobYMD, 0, 4); instead of $ dobYear = substr ($ dobYMD, 0, 4);
Just had to cast the instruction.
thank you all.

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