Error on lenya.zones.apache

As I try to update the tiny installation tuto, I would like to add this :

<li>
          TinyMCE require that upload is enable in your publication. To
enable upload set the <i>enable.upload</i> propertie to <i>true</i> in
your $LENYA_HOME/local.build.properties file.
        </li>

in the installation doc [1], but oneform editor complains about :
unknown element "document" (line 19, column 11).
And I can't save to docu.

This seems to have something about the forest plugin into the
lenya.zones.apache.

Someone know how to solve this ?

[1]
http://lenya.apache.org/docu20/standardmodules/tinymcemodulesection/tinymcemoduleoverview.html