Pensé que a alguien mas le venia sucediendo esta situación, al momento de tratar de colocar el bidget de Adsense...

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
	cl.bluecompany.bligoo.web.AjaxProxy.getActiveBlock(AjaxProxy.java:637)
	cl.bluecompany.bligoo.web.AjaxProxy.doPost(AjaxProxy.java:101)
	cl.bluecompany.bligoo.web.AjaxProxy.doGet(AjaxProxy.java:66)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.