สอบถาม PHP Error ADODB Fatal error: Class 'VARIANT'

include("../adodb5/adodb.inc.php");
ADOLoadCode("ado_mssql");
$db = &ADONewConnection('ado_mssql'); # create a connection
$myDSN="PROVIDER=MSDASQL;DRIVER={SQL Server};" . "SERVER=10.X.X.X;DATABASE=DEMO;UID=sa;PWD=;" ;
try{
$db->Connect($myDSN);
}catch (exception $e) { 
var_dump($e); 
adodb_backtrace($e->gettrace());
}
$rs = $db->Execute("select top 20 * from xxxxxx ");
$arr = $rs->GetArray();
print_r($arr);