java.lang.NoSuchFieldError: ROLE

I've been getitng this error after making incremental changes to my 
project.xml file. I have not yet identified the pattern, but after 
several iterations of development I always seem to end up with this 
error. First on plugin 12 and now also on plugin 13. I've also deleted 
project.bak before performing keel:maven and war.

[KeelMetaInfoManager] Initializing
java.lang.NoSuchFieldError: ROLE
        at 
org.apache.avalon.fortress.util.ContextManager.initializePoolManager(
ContextManager.java:543)
        at 
org.apache.avalon.fortress.util.ContextManager.initialize(ContextMana
ger.java:245)
        at 
org.apache.avalon.fortress.impl.DefaultContainerManager.getInitialize
dContextManager(DefaultContainerManager.java:87)
        at 
org.apache.avalon.fortress.impl.DefaultContainerManager.<init>(Defaul
tContainerManager.java:74)
        at 
org.apache.avalon.fortress.impl.DefaultContainerManager.<init>(Defaul
tContainerManager.java:68)
        at 
org.keel.core.container.KeelContainerFactory.getContainerManager(Keel
ContainerFactory.java:229)
        at 
org.keel.core.container.KeelContainerFactory.createContainer(KeelCont
ainerFactory.java:624)
        at 
org.keel.core.container.KeelContainerFactory.createContainer(KeelCont
ainerFactory.java:607)
        at 
org.keel.servers.KeelAbstractServer.initialize(KeelAbstractServer.jav
a:126)
        at 
org.keel.servers.KeelAbstractServer.getContainer(KeelAbstractServer.j
ava:106)
        at 
org.keel.servers.direct.KeelDirectServer.run(KeelDirectServer.java:61
)

I am also getting these warnings during build (not sure if they are 
related):

    [copy] Warning: Could not find file 
D:\Proj\JyotishApplications\AstroMatch\AstroMatchServer-3.0\logkit.properties 
to
 copy.
    [copy] Warning: Could not find file 
D:\Proj\JyotishApplications\AstroMatch\AstroMatchServer-3.0\roles.properties 
to
copy.
    [copy] Warning: Could not find file 
D:\Proj\JyotishApplications\AstroMatch\AstroMatchServer-3.0\instrument.propertie
s to copy.
    [copy] Copying 1 file to 
D:\Proj\JyotishApplications\AstroMatch\AstroMatchServer-3.0\target\axis\WEB-INF\lib

I have not found an easy way of getting back to a working build.
Thanks for the help,
Max
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