VS2015 ASP。“model”这个名字在当前上下文中并不存在

I was working on an ASP.NET MVC 4 in VS2013 and everything was fine, then I've uninstalled 2013 and installed 2015, I was able to open the project, build it and even run, everything works fine (run/debug). The problem is that all my views are covered in errors: I was working on an ASP.NET MVC 4 in VS2013 and