Firstly, this wrapper is really cool as I am looking for it for a while. But when digging into FluentWebUITesting, I encounter two issues:
The solution has been converted to VS2012 so that's probably why you're seeing the error message when you open it with 2010.
This project is deprecated as it uses WatiN to drive the browser. We have created a new project that uses WebDriver: https://github.com/mvbalaw/FluentBrowserAutomation