🚀 go-pugleaf

I have this code:
   string connS =
Provider=interbase;Database=192.198.0.1:C:\\db\\ENGLAND.GDB;UserName=SYSDBA;Password=masterkey";
   BdpConnection Conn = new BdpConnection();
   Conn.ConnectionString =connS;
   Conn.Open();
   Trans = (BdpTransaction)Conn.BeginTransaction();
   Comm = (BdpCommand) Conn.CreateCommand();
   Comm.Connection   = Conn;
   Comm.Transaction  = Trans;
   Comm.CommandText = "execute procedure SP_TEST(param1,param2)";
   Comm.Prepare();
   textBox1.Text = "";
   BdpDataReader rr = Comm.ExecuteReader();
   while(rr.Read())
   {
    textBox4.Text += rr.GetInt16(0).ToString();
   }
   rr.Close();

The stored procedure return 1 integer.
When the ExecuteReader method being run, the compiler give me thi message:

Non Managed Exception  "Borland.Data.Common.BdpException" in
borland.data.provider.dll

Additional Informations: Execute failed. message length error (encountered
0, expected 8)

What can i do?