Polylang installed – Static page ( Main Frontpage) not shown

Hi, I have just installed Polylang. Set the Finnish Frontpage (Etusivu) as the static page. I have now gone through 3 times everything, but cant understand why this page doesn’t show.
The error message I get is:

Error thrown
Call to a member function get_current_language() on nullO

Other frontpages are ok (and other pages in Finnish). I have translations for all Frontpages (swedish, english, spanish and finnish). Any idea why? Don’t know what other links I could send so that it shows what I’ve done (or not done) ? This being the most important page informing customers about the ungoing work on our pages, I hope someone can help !? Thank’s.

The page I need help with: [log in to see the link]