Try the solution in this thread and see if it works.
So i started up realm today and this error appeared: "D'oh this isnt good. an error has occured: unable to load language [en]"
Everything is up to date on my computer and i have no idea what has happened. I've tried both clients and the website and i get the same error. Im so confuzzled.
Try the solution in this thread and see if it works.