Failed to load Resouces from a Resource File

Question

I’m trying to make my Xamarin application internationalize. I followed the tutorial (https://developer.xamarin.com/guides/xamarin-forms/advanced/localization/) that works on Android, however, when testo in windows is exceeded the exception System.Resources.MissingManifestResourceException.
More specifically

An exception of type 'System.Resources.MissingManifestResourceException' occurred in mscorlib.ni.dll but was not handled in user code

Additional information: Unable to load resources for resource file "Projeto.Resources.AppResources" in package "df348a55-72cd-4de3-a7db-cb0ecacf1e0b".

How can I solve this problem?

Obs1: There are two RESX files (Appresources.resx and Appresources.es.resx) in a PCL that is referenced in the UWP project.
Note: Na TranslateExtension when I use it

ResourceManager resmgr = new ResourceManager(ResourceId
                            , typeof(TranslateExtension).GetTypeInfo().Assembly);

I’m using

ResourceManager resmgr = AppResources.ResourceManager;