[racket] planet question

I finally made scribble doc for my planet-fmt package. However, when trying
to build the package I receive a warning like:
 
Welcome to DrRacket, version 5.3.3.3--2013-02-18(1c2432e/a) [3m].
Language: racket [custom]; memory limit: 2000 MB.
(#<path:example.rkt> #<path:example.scrbl> #<path:info.rkt>)
MzTarring .\...
 
WARNING:
Package has no info.rkt file. This means it will not have a description or
documentation on the PLaneT web site.
#<path:c:\racket-jos\example\example.plt>
 
The following is a very stripped example that gives me this warning:
 
In directory example:
file make-package.rkt
subdirectory example
 
In the subdirectory:
file example.rkt
file example.scrbl
file info.rkt
 
make-package.rkt
#lang racket
(require planet/util)
(force-package-building? #t)
(build-scribble-docs? #t)
(directory-list "example") ; gives correct list of files.
(make-planet-archive (string->path "example"))
 
example.rkt
#lang racket
(provide example)
(define (example) 'example)
 
example.scrbl
#lang scribble/manual
@(require "example.rkt" scribble/eval (for-label "example.rkt" racket))
@title{A simple example}
@author{Jacob J. A. Koot}
@(defmodule "example.rkt")
@section{Example}
This is @code{example}.
@defproc[(example) 'example]
 
info.rkt
#lang setup/infotab
(define scribblings (list (list "example.scrbl")))
(define name "example")
(define blurb (list "A simple example"))
(define primary-file "example.rkt")
(define categories (list 'misc))
 
I run make-package.rkt from DrRacket. File example.plt is prepared, but the
warning appears. What do I wrong? Furthermore, when trying to update my
planet-fmt package after logging in into planet, I get an error message,
something like
 
Oops, something went wrong ...
 
No new version is installed.
Help please.
Thanks, Jos

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