Xamarin Visual studio cannot detect view in same namespace - xaml

Question

This is my first Xamarin Project and already, I've run into a weird issue.
Fromt he MainPage.xaml, I'm triyng to call the ItemDetailsPage with ItemFetailViewModel as a param.
Upon compilation, VS throws "The type or namespace name 'ItemDetailsPage' could not be found". There is no red underlines.
I've checked that the namaespaces are correct in both the .xaml and .xaml.cs
MainPage.xaml.cs
namespace testapp3.Views
public partial.....
{
Method()
{
await Navigation.PushAsync(new ItemDetailsPage(new ItemDefailViewModel(item)
}
}
ItemDetailsPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="testapp3.Views.ItemDetailsPage">
</ContentPage>
ItemDetailsPage.xaml.cs
namespace testapp3.Views
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ItemDetailsPage : ContentPage
{
ItemDetailViewModel viewModel;
public ItemDetailsPage ()
{
InitializeComponent ();
}
public ItemDetailsPage(ItemDetailViewModel item)
{
InitializeComponent();
BindingContext = this.viewModel = item;
}
}
}