CS0012: The type 'System.Object' is defined in an assembly that is not referenced.
I was setting up my Sitecore instance(s) on a new laptop, when this error reared its ugly head and kept me stuck for a good hour. Looking online there are many reasons why this showed up, but in my case, all I had to do was adding this line under configuration/system.web/compilation/assemblies: <add assembly="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51"/> […]
Random error after upgrading some NuGet packages: "You must add a reference to assembly 'netstandard, Version=2.0.0.0"
Just a very quick write-up on this as it kept me busy for a couple of hours looking for a solution. After upgrading a number of NuGet packages (Microsoft ASPNet WebApi 2.2 Core Libraries, Microsoft ASPNet MVC, HtmlAgilityPack), my perfectly working Sitecore local development setup stopped working, instead throwing the exception CS0012: The type 'System.Object' […]