Sadly, I still cannot make it work. Now it compiles ok but when I run the
M-x blorg-publish command on the file

--------------------------------------
#+TITLE: meltemi
#+BLOG_URL: http://localhost/blorg/
#+PUBLISH_DIR: g:/htdocs/BLORG/


* DONE This is my first entry         :misc:
       CLOSED: [2008-01-30 Τετ]

     Hello world!
--------------------------------------

as described in the manual, It just says

 Wrong type argument: stringp, nil

and does nothing

sorry for bathering you again