I'm trying to use a contextMenu component with myfaces and I get the following javascript error:

Error: syntax error
Source File: http://localhost:8080/richfaces/a4j_3_1_3.GAorg/ajax4jsf/framework.pack.js.jsf
Line: 149
Source Code:
<!--

To test this error, I downloaded the richfaces live demo and ran it with no problem using the JSF SUN RI Later, I switch to the myfaces jsf implementation(1.2.0 and also tried 1.1.5) and got the js error when running the contextMenu example. Please advice on how fix this problem.

Regards
Pablo