I am new here. Yesterday I've downloaded and installed the Microsoft Visual Studio Community 2015 first and then download the Lean-Programm. I open the 'QuantConnect.Lean.sln' in Visual Studio. But as I try building the project with Ctrl+F5, I got a lot of errors and most of them are CS0234 "The type or namespace name 'Configuration' does not exist in the namespace 'QuantConnect' #are you missing an assembly reference?#"

Someone could help?