"Enabling Flyspell mode gave an error" and also "Error: The filter "nroff" does not exist"

Hello

I want to use aspell on my emacs (to use it on flyspell mode) and I  
run into two errors :

1)
Starting new Ispell process [francais] ...
Enabling Flyspell mode gave an error

2)
Starting new Ispell process [francais] ...
ispell-init-process: Error: The filter "nroff" does not exist.

here is the bit of unix command to show I correctly installed aspell :
~ : aspell dicts
fr-40
fr
fr-60
fr-80
fr-lrg
fr-med
fr-sml
fr_CH-40
fr_CH
fr_CH-60
fr_CH-80
fr_CH-lrg
fr_CH-med
fr_CH-sml
fr_FR-40
fr_FR
fr_FR-60
fr_FR-80
fr_FR-lrg
fr_FR-med
fr_FR-sml

and here is the piece of my .emacs-d/init.el concerning aspell
(setq-default ispell-program-name "aspell")
(setq ispell-dictionary "francais"
ispell-dictionary-alist
(let ((default '("[A-Za-z]" "[^A-Za-z]" "[']" nil
("-B" "-d" "fr_FR" "--dict-dir"
"/Library/Application Support/cocoAspell/aspell-fr-0.50-3")
nil utf-8)))
`((nil ,@default)
("francais" ,@default))))
(setq ispell-tex-skip-alists
       (list
        (append (car ispell-tex-skip-alists)
                '(("\\\\cite"            ispell-tex-arg-end)
                  ("\\\\nocite"          ispell-tex-arg-end)
                  ("\\\\includegraphics" ispell-tex-arg-end)
                  ("\\\\figScale"         ispell-tex-arg-end)
                  ("\\\\author"          ispell-tex-arg-end)
                  ("\\\\ref"             ispell-tex-arg-end)
                  ("\\\\eqref"             ispell-tex-arg-end)
                  ("\\\\label"           ispell-tex-arg-end)
                  ))
        (cadr ispell-tex-skip-alists)))
  (eval-after-load "ispell"
   '(let ((list (car ispell-tex-skip-alists)))
      (add-to-list 'list '("\\\\cite[tp]" ispell-tex-arg-end))
      (setcar ispell-tex-skip-alists list)))

has anyone any idea about the source of my trouble ?

	thanks a lot

	H. Dicky

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