Errors in contextblock

A block that was working few weeks ago, now is throwing an exception:

00:31:25.886 [btpool0-1] DEBUG o.a.c.jci.stores.MemoryResourceStore -
reading resource java/lang/ObjectBeanInfo.class
00:31:25.895 [btpool0-1] DEBUG o.a.c.s.DispatcherServlet -
DispatcherServlet: service
servlet=org.apache.cocoon.servlet.XMLSitemapServlet@1d1f967
mountPath=/contents servletPath=/contents
pathInfo=/article/760917/en.xml
00:31:25.900 [btpool0-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory -
Returning cached instance of singleton bean
'org.apache.cocoon.jnet.URLHandlerFactoryCollector'
00:31:25.901 [btpool0-1] DEBUG o.s.b.f.s.DefaultListableBeanFactory -
Returning cached instance of singleton bean
'org.apache.cocoon.configuration.Settings'
00:31:25.909 [btpool0-1] ERROR o.a.cocoon.servlet.XMLSitemapServlet -
Can't initialize the RequestProcessor correctly.
org.apache.cocoon.servlet.RequestProcessor$InvalidBaseUrlException: An
exception occurred while retrieving the base URL from the servlet
context.
        at org.apache.cocoon.servlet.RequestProcessor.initializeBaseURL(RequestProcessor.java:174)
~[cocoon-servlet-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.cocoon.servlet.RequestProcessor.<init>(RequestProcessor.java:81)
~[cocoon-servlet-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.cocoon.servlet.XMLSitemapServlet.lazyInitialize(XMLSitemapServlet.java:68)
[cocoon-servlet-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at org.apache.cocoon.servlet.XMLSitemapServlet.service(XMLSitemapServlet.java:46)
[cocoon-servlet-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
[servlet-api-2.5-6.1.7.jar:6.1.7]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
~[na:1.6.0_37]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
~[na:1.6.0_37]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
~[na:1.6.0_37]

.....

at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
[jetty-6.1.7.jar:6.1.7]
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
[jetty-6.1.7.jar:6.1.7]
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
[jetty-6.1.7.jar:6.1.7]
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
[jetty-6.1.7.jar:6.1.7]
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
[jetty-6.1.7.jar:6.1.7]
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
[jetty-6.1.7.jar:6.1.7]
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
[jetty-util-6.1.7.jar:6.1.7]
Caused by: java.net.MalformedURLException: unknown protocol: blockcontext
	at java.net.URL.<init>(URL.java:574) ~[na:1.6.0_37]
	at java.net.URL.<init>(URL.java:464) ~[na:1.6.0_37]
	at java.net.URL.<init>(URL.java:413) ~[na:1.6.0_37]
	at org.apache.cocoon.servletservice.ServletServiceContext.getResource(ServletServiceContext.java:114)
~[cocoon-servlet-service-impl-1.3.2.jar:1.3.2]
	at org.apache.cocoon.servlet.RequestProcessor.initializeBaseURL(RequestProcessor.java:168)
~[cocoon-servlet-3.0.0-beta-1-SNAPSHOT.jar:3.0.0-beta-1-SNAPSHOT]
	... 55 common frames omitted
00:31:25.910 [btpool0-1] DEBUG o.a.c.jci.stores.MemoryResourceStore -
reading resource org/apache/cocoon/servlet/XMLSitemapServlet.class



This is the bean definition:

        <bean name="ca.example.cms.contents.service"
class="org.apache.cocoon.servlet.XMLSitemapServlet">
                <servlet:context mount-path="/contents"
context-path="blockcontext:/contents/" />
        </bean>



I am not sure if something changed recently, but now it's not
recognizing blockcontext !!!!