this is my error :
unable to open directory in auth_cleanup: ./auth. Reason: No such file or directory
Now db.cgi,html.pl,auth.pl,default.cfg,default.pass,default.count,default.log,default.db and readme.txt was inclosed in the dbman zip file
but readme.txt specifies another auth file that was not included with permision (777)
can that be the problem ?

You need a directory called "auth" with the permission 777. Just make one.
For the security purpose include an index.html file in that directory, so the user doesn't get a directory listing.

Jawarz