What I needed to do was adding to the _config.inc file:

<script>
    CKEDITOR.replaceAll( 'ckeditor2' );
</script>

Now it works. Thanks.

pd: maybe you can add that little clue to 'Installing Editors' doc page

Thanks Raul, this worked for me. There is not enough info on the doc.

Raul Serrano said:

What I needed to do was adding to the _config.inc file:

<script>
  CKEDITOR.replaceAll( 'ckeditor2' );
</script>

Now it works. Thanks.

pd: maybe you can add that little clue to 'Installing Editors' doc page

:) Good to know Brandon