CreateFileAsync freezes app

Question

I am trying to get one line of code working in a Windows 10 UWP.

private static async Task MakeFile()
{
  var file = await 
  Windows.Storage.ApplicationData.Current.TemporaryFolder.CreateFileAsync("bob", CreationCollisionOption.GenerateUniqueName);
}

For some reason When I try to run this the whole app freezes and never comes back

Answer 1

I didn't want to update beyond the stable version. I tried without debugging and on the main thread with no luck. So I created a new project and tried it there and it worked fine. So I just redid the app and copied my code over and now it works. Something must have gotten corrupt in that project