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Warning: Undefined variable $conn in C:\xampp\htdocs\mrc_labor - Copy (2)\labor_case_dati\labor_admincase_menu_plant.php on line 23

Fatal error: Uncaught Error: Call to a member function query() on null in C:\xampp\htdocs\mrc_labor - Copy (2)\labor_case_dati\labor_admincase_menu_plant.php:23 Stack trace: #0 {main} thrown in C:\xampp\htdocs\mrc_labor - Copy (2)\labor_case_dati\labor_admincase_menu_plant.php on line 23