Event Store Windows server 2008

I’m trying to run Event Store on windows server 2008 r2 and I get the following Error when I try to run it.

Unhandled Exception: System.MissingMethodException: Method not found: ‘!!0[] System.Array.Empty()’.
at EventStore.Core.ProgramBase`1.Run(String[] args)
at EventStore.ClusterNode.Program.Main(String[] args) in :line 0

I can’t seem to find any suggestion as to what is going on and how to fix it. Any clues?

This is most likely due to not having .NET 4.5 installed.

So .NET 4.5 is installed, and another webApp is running under that framework. I Installed v 3.9.4, and all is running. (I’ve not got the api that will be using it up and running yet though, so we’ll see)