Fatal error: Uncaught mysqli_sql_exception: Duplicate column name 'probation_period' in C:\laragon\www\wms\run_add_probation.php:6 Stack trace: #0 C:\laragon\www\wms\run_add_probation.php(6): mysqli->query('-- employment_c...') #1 {main} thrown in C:\laragon\www\wms\run_add_probation.php on line 6