C#, WPF Application error - System.Security.SecurityException was unhandled by user code

Question

I've created a WPF applicaiton in VS2008.  It's a simple application that has a button in the browser.  Once the button is clicked, an sms text is supposed to be sent to a phone number via the skype API.  However, I get the "System.Security.SecurityException was unhandled by user code" message.  Any thoughts as to how to get around the error?

Here's the code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace GenevaText
{
    /// <summary>
    /// Interaction logic for Page1.xaml
    /// </summary>
    public partial class Page1 : Page
    {
        
        public Page1()
        {
            InitializeComponent();
        }

        //User presses button to send a sms message to the appropriate phone number
        private void btnTestMsg_Click(object sender, RoutedEventArgs e)
        {
            SKYPE4COMLib.SkypeClass objSkype = new SKYPE4COMLib.SkypeClass();
            objSkype.SendSms("3125551212", "test message", "3125551111");
        }
    }
}