xamarin forms windows phone 8.1 camera access crash xamarin media

Hi, i'm trying to use the Xamarin.Media plugin to access the camera on windows phone 8.1, i'm using the default code to do so (see screen shot attached), but when i click on the button to open the camera, the code crashes on this line:

" var file = await CrossMedia.Current.TakePhotoAsync(test);"

I have attached a stack trace from an exception which says that it crashes because "XAML parsing failed",

this code works on my android project, but i cant get my head around why it wont work for windows phone 8.1.

i have the media package installed across my project as well as having the correct permission for the camera selected.

Can anyone help?

thanks in advance