I'm trying use Vungle to add Video for my app. enter link description here
But i have 2 bug below:
1: Error 1 Cannot await 'Windows.Foundation.IAsyncOperation1<string>'
[2]:Error 2 The type 'Windows.Foundation.IAsyncOperation
1' is defined in an assembly that is not referenced. You must add a reference to assembly 'Windows.Foundation.FoundationContract, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null, ContentType=WindowsRuntime'.
Anyone know, what thing i must do to fix that bug !