Thank you for the quick response.
I also tried to replace the ø in my name with o and that also seemed to help, since it then gave me that error you are referring to instead of a blank page.
For some reason I just tried to see if an import functionality had been implemented, and I was happy to see that it seems so. However when I tried to import a GPX export from Endomondo i was directed to upload.do which just presented a blank page. There is nothing in the console log and no feedback from the page, so i don't know what went wrong. I know that it is still Alpha and I would be happy to help test this functionality.