Windows Phone 8.1 HubApp + HtmlAgilityPack

I know that using HAP in windows phone apps is very problematic, but I very need to. So the problem is that when I add System.Xml.XPath from silverlight 5 or 4 I get 'Xaml Internal

Solution 1:

Use the HtmlAgilityPack-PCL nuget package with Windows Phone 8.1 XAML apps, it works fine with no need to add any references manually.