Solved: Blogger login error (bX-dbgk87, bX-r81rbo, bX-tyuegn, bX-thqfnx)

It seems that I received that errors  (bX-dbgk87, bX-r81rbo, bX-tyuegn, bX-thqfnx) because something was left unfinished on the blog. The only thing I did - I accessed blogger account with help of this site. Then I tried to log in again normally and it worked.

I hope it works for you as well.