Ah it seems like detlev used the wrong link.
We haven't accounted yet for "www." at the beginning :/
(But I will shortly update the server to also react to www. ;) )

This would be the working link for him:
http://steemknights.com/ref/@detlev

I was already wondering why he hasn't gotten more refs to be honest 😉

Greetings,
-@mwfiae