Every thing is set, All references are set to Nevron.Presentation and I am trying to build the project, but it shows the error "The type or namespace name 'NButton' could not be found (are you missing a using directive or an assembly reference?)"

Previously I am using Nevron dll of version 10.3.31.12, now I am trying to use latest version 17.8.21.12 is this a problem, I am trying to use it in Visual studio 2012 and DotNet Frame Work 4.

Please help me on this, refer to image below