✅ Operator ! cannot be applied to type string

if (FPM.Main.ShortcutStartMenu.Checked)
{
    if (!Environment.GetFolderPath(Environment.SpecialFolder.Programs))
    {
        shortcutPaths.Add(Environment.GetFolderPath(Environment.SpecialFolder.StartMenu));
    }
    else
    {
        shortcutPaths.Add(Environment.GetFolderPath(Environment.SpecialFolder.Programs));
    }
}