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Deprecated: DateTime::createFromFormat(): Passing null to parameter #2 ($datetime) of type string is deprecated in /var/www/smartwork/apps/job_free/pages/mission_calculate.php on line 28

Fatal error: Uncaught TypeError: date_add(): Argument #1 ($object) must be of type DateTime, false given in /var/www/smartwork/apps/job_free/pages/mission_calculate.php:29 Stack trace: #0 /var/www/smartwork/apps/job_free/pages/mission_calculate.php(29): date_add() #1 /var/www/smartwork/apps/job_free/pages/mission.php(21): require_once('...') #2 /var/www/smartwork/index.php(85): require_once('...') #3 /var/www/smartwork/index.php(137): displayAppPage() #4 {main} thrown in /var/www/smartwork/apps/job_free/pages/mission_calculate.php on line 29