Execute DTS Package: Permisson Issues?

Hi guys,

I'm [trying to] execute a SSIS project (.dtsx file)... from a web service.
I find that if i do package.Execute() from a test or console app it goes just fine. But when I try to execute the package from within a web service, it says it failed.
I presume is a permisson issues (and that would make perfect sense). Is it right?
Is there a way to circunvent this?

Thanks a lot!

Code, using C# .NET 2.0:





Code Snippet
using Microsoft.SqlServer.Dts.Runtime;

namespace Biz
{

public class Helper
{

public static String YadaYada()
{

DTSExecResult _result = DTSExecResult.Failure;
Application app = new Application();
Package package = new Package();
package = app.LoadPackage("C:\YadaYada.dtsx", null);
_result = package.Execute();
return _result.ToString();
}
}
}