Xaml Parse Exception

I'm getting this in my project - only I don't use Xaml. Any thoughts?

• ExceptionObject {System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0] ---> System.Windows.Markup.XamlParseException: [Line: 0 Position: 0]
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.UIElement_Measure(UIElement element, Size availableSize)
  at System.Windows.UIElement.Measure(Size availableSize)
  at Microsoft.Phone.Controls.LongListSelector.RealizeDisplayItem(Iterator`1 iterator, RealizeOptions options)
  at Microsoft.Phone.Controls.LongListSelector.RealizedRange.Append(RealizedRange nextRange, Double bottom)
  at Microsoft.Phone.Controls.LongListSelector.AppendElement(RealizedRange range, RealizedRange nextRange, Double bottom)
  at Microsoft.Phone.Controls.LongListSelector.HealElements(Rect requireRect, Rect allowRect, Boolean& areBoundsUpdated)
  at Microsoft.Phone.Controls.LongListSelector.Balance(Boolean containerViewport)
  at Microsoft.Phone.Controls.LongListSelector.MeasureOverride(Size availableSize)
  at Xamarin.Forms.Platform.WinPhone.FixedLongListSelector.MeasureOverride(Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.Controls.Canvas.MeasureOverride(Size constraint)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.Controls.Canvas.MeasureOverride(Size constraint)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.Controls.Canvas.MeasureOverride(Size constraint)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at Microsoft.Phone.Controls.PivotItem.MeasureOverride(Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at Microsoft.Phone.Controls.Pivot.MeasureOverride(Size availableSize)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.Controls.Canvas.MeasureOverride(Size constraint)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
  at MS.Internal.XcpImports.FrameworkElement_MeasureOverride(FrameworkElement element, Size availableSize)
  at System.Windows.Controls.Canvas.MeasureOverride(Size constraint)
  at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Double inWidth, Double inHeight, Double& outWidth, Double& outHeight)
  --- End of inner exception stack trace ---} System.Exception {System.Windows.Markup.XamlParseException}