Delphi 7 :: Executing MS SQL 2005 Stored Procedure with Output Variabel

Please see my Delphi code below, when running this code I receive the following Delphi runtime error message: see attached image...

var
  sResult :String;
begin
  ADOStoredProc1.ProcedureName := 'spGetTritonPartTypes';
  ADOStoredProc1.Parameters.Refresh;
  ADOStoredProc1.Parameters.ParamValues['@po']  := '5000';
  ADOStoredProc1.ExecProc;
  sResult := ADOStoredProc1.Parameters.ParamValues['@output'];
 
  ShowMessage(sResult);
end;

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sp-error.jpg

use a TADOQuery and do it like this

ADOQuery1.SQL.Text :=  'set nocount on' + #13#10 +
                                          'declare @res int ' + #13#10 +
                                          'exec @spGetTritonPartTypes :po, @output OUTPUT ' + #13#10
                                          'set nocount off ' + #13#10 +
                                          'select @res as res';

with adoquery1.parameters.parambyname('po') do
begin
  paramtype := ftInteger;
  value := 5000;
end;
AdoQuery1.Open;
ShowMessage(ADOQuery1.FieldByName('res').AsInteger);

something like that anyway, I'm not near my dev p.c.

Thanks for the reply.
Just 1 fix and it is working 100%.

 "@spGetTritonPartTypes"
 shoud be: "spGetTritonPartTypes"

Thanks again.