Fatal error: Uncaught TypeError: sqlsrv_query(): Argument #1 ($conn) must be of type resource, bool given in G:\HOST\wmsdemo\getmax_pickserno.php:16 Stack trace: #0 G:\HOST\wmsdemo\getmax_pickserno.php(16): sqlsrv_query(false, 'select isnull(m...') #1 {main} thrown in G:\HOST\wmsdemo\getmax_pickserno.php on line 16