When you click on <Send Book to Blurb> a dialog should come up that asks for your ID and password for your Blurb account. I don't know if Blurb ships to Norway - you probably can find out at the Blurb website. But I don't think that this is the problem here since you also cannot export a PDF or JPGs.
I don't know of any specifics why this is not possible for you but it's worth trying to replace the Preference File.
This file can go "funny" and is then responsible for all kinds of strange behavior of Lr. The remedy is replacing the Preference File.
BTW: Re-installing Lr or updating / upgrading Lr does not replace the Preference File since it is designed to "survive" upgrades.
See here for where to find the Preference file for your OS: http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroo m-4.html
See here for how to go about Replacing the Preference File: http://lightroomers.com/replacing-the-lightroom-preference-file/745/