Richfaces 4.1 A4J.AJAX.onError or jsf.ajax.addOnError?

[mhn]

I am right now migrating from richfaces 3.3.3 to 4.1.

The 3.3.3 Ajax4jsf handlers are not working anymore in 4.1

3.3.3:

A4J.AJAX.onError=function(req,status,message) {...}

Now I tried jsf.ajax.addOnError(myEventHandler) but this is also not working.

It throws a Javascript error on every page: "Error: 'jsf' is undefined".

How do I get this working with JSF 2 (myFaces) and Richfaces 4.1 ?

[mhn]

Script import solved the issue:

<h:outputScript name="jsf.js" library="javax.faces"/>