Hi all,

I'm in the process of updating from 5.0.17 to the latest stable release:
5.1.0.5
Most of the process is pretty smooth except the following: 

on page X I have an actionlink defined which updates a zone. (see snippets
below) . 
The problem is thaty I'm getting  a 'conflicting contribution error' when
clicking the actionlink thus trying to populate the zone. Everything worked
fine in  5.0.17. 
Anyone knows what's wrong? 

relevant info below.
thanks, 
Geert-Jan

.tml
----------------------------------
zoek bestemming 

<div t:type="zone" t:id="locationhelpZone" t:visible="false"
id="locationhelpZone" class="mff" style="display:none;">
                 # close 
                <div class="popcont t-zone-update"/>
</div>

relevant snippet of class X:
------------------------------------
Object onActionFromLocationhelp(){
                return
getResources().getComponent().getComponentResources().getEmbeddedComponent
("locationHelper");
        }


error: (enormous stacktrace, only showing the root-cause. BTW: I couldn't
find any classes of my own that were referenced in the stacktrace)

Caused by: java.lang.IllegalArgumentException: Service contribution (to
service 'AjaxComponentEventResultProcessor') conflicts with existing
contribution (by
org.apache.tapestry.commons.TapestryCommonsModule.contributeAjaxComponentEventResultProcessor(MappedConfiguration,
ObjectLocator, Response) (at TapestryCommonsModule.java:127)).
        at
org.apache.tapestry5.ioc.internal.ValidatingMappedConfigurationWrapper.add(ValidatingMappedConfigurationWrapper.java:83)
        at
org.apache.tapestry5.ioc.internal.ValidatingMappedConfigurationWrapper.addInstance(ValidatingMappedConfigurationWrapper.java:115)
        at
org.apache.tapestry5.services.TapestryModule.contributeAjaxComponentEventResultProcessor(TapestryModule.java:1535)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at
org.apache.tapestry5.ioc.internal.ContributionDefImpl.invokeMethod(ContributionDefImpl.java:110)
        ... 114 more

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