UWP Map Control Binding - dictionary

Question

In my UWP application: I have a SQLite data base with some points and it's coordinates. I am using Entity Framework 7 and I want to bind the data to a map control. Since I only want to keep the coordinates in the database. I created a partial class to add the other required properties to bind to the map:
//Database Fields
public partial class oFeature
{
[Key]
public string idRecord { get; set; }
public string idTag { get; set; }
public Double Latitude { get; set; }
public Double Longitude { get; set; }
public string ImageSourceUri { get; set; }
public string MoreInfo { get; set; }
}
//Binding Required Fields
public partial class oFeature
{
[NotMapped]
public Geopoint Location { get; set; }
[NotMapped]
public Point NormalizedAnchorPoint { get; set; }
[NotMapped]
public Uri UriSourceImage { get; set; }
}
To create the list for the binding I have the following code:
IQueryable<oFeature> myFeatures;
using (var db = new fldContext())
{
myFeatures = from b in db.oFeatures
select new oFeature()
{
idRecord = b.idRecord,
idTag = b.idTag,
Latitude = b.Latitude,
Longitude = b.Longitude,
ImageSourceUri = b.ImageSourceUri,
MoreInfo = b.MoreInfo,
Location = new Geopoint(new BasicGeoposition(){Latitude=b.Latitude,Longitude=b.Longitude}),
NormalizedAnchorPoint = new Point(0.5, 0.5),
UriSourceImage = new Uri("ms-appx:///Assets/green.png")
};
int recount = myFeatures.Count();
var sourceData = myFeatures.ToList();
MapItems.ItemsSource = sourceData;
}
If I remove the location line:
Location = new Geopoint(new BasicGeoposition(){Latitude=b.Latitude,Longitude=b.Longitude})
The code works but of course when I bind to the map I get an error because I have no locations. But If I keep the locations line I get an error at the line:
int recount = myFeatures.Count();
I am getting the following error:
An exception of type 'System.ArgumentNullException' occurred in System.Linq.Expressions.dll but was not handled in user code
Additional information: Value cannot be null.
{"Value cannot be null.\r\nParameter name: constructor"}
Any help would be appreciated.