Error 404 in the site of Avalon

Hi,

First, I don't know if this is the right place to send this message.
If it isn't, sorry this message. What is the right address?

If it is:
In the section guides, Developing with Avalon, the link 
"Compatibility with Avalon" is invalid (error 404).

Link with problems:
http://jakarta.apache.org/avalon/developing/compatiblity.html

Thanks anyway,
Jonas

PS: I'm not subscribed in this list.