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Fatal error: Uncaught TypeError: sqlsrv_query(): Argument #1 ($conn) must be of type resource, false given in C:\wamp64\www\vermi_mobile\9.1\get_purchase_order_list.php:33 Stack trace: #0 C:\wamp64\www\vermi_mobile\9.1\get_purchase_order_list.php(33): sqlsrv_query(false, 'SELECT \tpuo_mst...') #1 {main} thrown in C:\wamp64\www\vermi_mobile\9.1\get_purchase_order_list.php on line 33