After attempting to upgrade to RichFaces 3.1.4, I get the following error on startup. Any clues as to what the problem is?

javax.faces.FacesException: org.ajax4jsf.framework.renderer.ChameleonRenderKitFactory
at javax.faces.FactoryFinder.getImplGivenPreviousImpl(FactoryFinder.java:556)
at javax.faces.FactoryFinder.getImplementationInstance(FactoryFinder.java:448)
at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:249)
at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:1096)
at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:543)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:436)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3831)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4323)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
at org.apache.catalina.core.StandardService.start(StandardService.java:480)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at javax.faces.FactoryFinder.getImplGivenPreviousImpl(FactoryFinder.java:549)
... 20 more
Caused by: javax.faces.FacesException: java.lang.IllegalArgumentException: argument type mismatch
at org.ajax4jsf.framework.resource.ResourceBuilderImpl.registerConfig(ResourceBuilderImpl.java:193)
at org.ajax4jsf.framework.resource.ResourceBuilderImpl.registerResources(ResourceBuilderImpl.java:131)
at org.ajax4jsf.framework.resource.ResourceBuilderImpl.init(ResourceBuilderImpl.java:202)
at org.ajax4jsf.framework.renderer.ChameleonRenderKitFactory.(ChameleonRenderKitFactory.java:62)
... 25 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at org.apache.commons.digester.Digester.createSAXException(Digester.java:3181)
at org.apache.commons.digester.Digester.createSAXException(Digester.java:3207)
at org.apache.commons.digester.Digester.endElement(Digester.java:1225)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1765)
at org.ajax4jsf.framework.resource.ResourceBuilderImpl.registerConfig(ResourceBuilderImpl.java:186)
... 28 more