Missing ; before LatentActionManager.h

I just started up a project that was working last week but which gives my now this error and a couple more.

It is in a class of unreal itself so I’m currently a bit confused on how to solve this… Starting a new project works and other members of my team are able to run it.
Could it be because I just updated to windows 8.1?
It is the only thing I changed on my laptop since me working on the project.

Thanks in advance!