title: there was internal issue with the rendering process - XAML previewer
body: <p>I am totaly new to xamarin framework, i have just created an app with UI technology Xamarin.Forms and Code Sharing Strategy .NET Standard and i am using Visual Studio 2017 15.5.7 . </p>
  
  <p>When I try to preview the default app template with the XAML Previewer, I get this error "There was an internal issue with the rendering process". I have given the screenshot below. I have tried alot to solve the problem but faild.
  What should i do to solve this problem? </p>
  
  <p><a href="https://1drv.ms/u/s!AmfedwXYYdKe3HfQbHZBsM31ZSTO" rel="nofollow noreferrer">https://1drv.ms/u/s!AmfedwXYYdKe3HfQbHZBsM31ZSTO</a></p>