Execute MSSQL Stored Procedure

==> The requested action with this object has failed.:
$rs.Open("declare @aa int exec NewAnalyzeNumber @aa output,1 select @aa as value",$conn)
$rs.Open("declare @aa int exec NewAnalyzeNumber @aa output,1 select @aa as value",$conn)^ ERROR
>Exit code: 1 Time: 0.412

Func AnalyzeNumber()
$conn = ObjCreate( "ADODB.Connection" )
$conn.Open("Provider=SQLOLEDB;Data Source="&$serwer[2]&";Initial Catalog="&$baza[2]&";Connect Timeout=150;Network Library=dbmssocn; User ID="&$uzytkownik[2]&"; Password="&$haslo[2]&";")
$rs = ObjCreate("ADODB.RecordSet")
$rs.Open("declare @aa int exec NewAnalyzeNumber @aa output,1 select @aa as value",$conn)
MsgBox(0, "test",$rs.Fields("value").Value)
$conn.Close
EndFunc