sample WindowsGL failed to build

I am trying to get properly familiar with the current build of MonoGame Framework. I have tried to learn it by attempting a port of an old Xna RPG game but have not succeeded and believe its because I need more knowledge of the MonoGame setup so have resorted to being a newby and going through tutorials and samples.
I am running VC 2017 and latest MonoGame cloned from git and rebuilt using VS 2017. I have cloned the samples from Git and am trying to build/Run those that are for Windows. I started with WindowDX thinking it was for DirectX but although it built it failed to run and got some error about not finding something from SharpDX. I next tried the WindowsGL as that was the only one left for Windows and that one failed to build with error in MGCB.exe about lack of XactImporter.
Anyone help me?