I am, not even clicking the leader roll. It works all fine when i manually queue up. But after it's done with the dungeon and gets ready for a new one, that "You did not select any valid slots" pops up.
I restarted wow and hb, started it up, and went all fine, did not get any errorpopup, if i get it after this dungeon is done, ill edit this post.
Bless!