Notice: Trying to access array offset on value of type null in D:\laragon\www\ubl21dian\GetStatus.php on line 18

Fatal error: Uncaught Exception: The trackId property has to be defined in D:\laragon\www\ubl21dian\vendor\stenfrank\ubl21dian\src\Templates\TemplateProd.php:61 Stack trace: #0 D:\laragon\www\ubl21dian\vendor\stenfrank\ubl21dian\src\Templates\TemplateProd.php(35): Stenfrank\UBL21dian\Templates\TemplateProd->requiredProperties() #1 D:\laragon\www\ubl21dian\GetStatus.php(20): Stenfrank\UBL21dian\Templates\TemplateProd->sign() #2 {main} thrown in D:\laragon\www\ubl21dian\vendor\stenfrank\ubl21dian\src\Templates\TemplateProd.php on line 61