Error while creating shortcut button C#

I'm trying to have a button that once you press it, it will create a shortcut.

Any time I press the button I am getting an error

An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred

Additional information: Exception occurred. (Exception from HRESULT: 0x80020009 (DISP_E_EXCEPTION))

Can anyone see why this is happening?

public static void CreateShortcut(string shortcutName)
    {
        WshShell wsh = new WshShell();
        string fileName = savDir + "\\" + ProductName + ".ink";

        IWshShortcut shortcut = (IWshShortcut)wsh.CreateShortcut(fileName);
        shortcut.Targetpath = Application.ExecutablePath;
        shortcut.Save();

    }


    private void button2_Click(object sender, EventArgs e)
    {
        string folder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
       CreateShortcut("folder");
    }

Your call to CreateShortcut looks wrong:

CreateShortcut("folder");

should be (no quotes):

CreateShortcut(folder);