I tried to set up my very first visual studio solution for PlayFab as per the steps followed in this article:- https://docs.microsoft.com/en-us/gaming/playfab/sdks/c-sharp/quickstart But I keep getting the following error whenever I try to add the NuGet package:- Failed to add reference to 'System.Runtime'. Please make sure it is in the Global Assembly Cache. The code and the steps are exactly as specified in the article. Any idea how to get rid of this message? Adding any other non playfab package works smoothly.