System.ArgumentException: 'The path is not of a legal form.'

[KubaKajderowicz]

When i try to use await element.SlideAndFadeInAsync(...) i get the error : System.ArgumentException: 'The path is not of a legal form.'

this happens when i run the following code:
protected override async void DoAnimation(FrameworkElement element, bool value, bool firstLoad) { if (value) // Animate in await element.SlideAndFadeInAsync(AnimationSlideInDirection.Bottom, firstLoad, firstLoad ? 0 : 0.3f, keepMargin: true); else // Animate out await element.SlideAndFadeOutAsync(AnimationSlideInDirection.Bottom, firstLoad ? 0 : 0.3f, keepMargin: true); }}

This happens when the value is true

[KubaKajderowicz]

Deleting Bin and Obj folder did the trick!