Notice: Array to string conversion in line 7

require_once 'connection.php';
require_once 'session.php';

$tsql = "SELECT * FROM TRANSACTION_PO";

$result = sqlsrv_query($conn, $tsql, array(), array( "Scrollable" => SQLSRV_CURSOR_KEYSET )) OR die(sqlsrv_errors()); // LINE 7 (ERROR)

    echo
    '<table id="t01" width="95%" align="center" cellpadding="" cellspacing="0" border="1">';


if (!$result) {
 die("Query to show fields from table failed");
}

while($row = sqlsrv_fetch_array($result))
{


    echo
    '<tr>
    <td><div align="center">' . $row ['StockId'] . '</div></td>
    </tr>';

}
echo "</table>";
sqlsrv_free_stmt($result);
sqlsrv_close($conn);
?>