I'm inheriting the Simplicity skin in my project.gwt.xml like this.
	It was working fine with the 2010-12-15 build, but I just got the latest nightly and ran into this error when starting the app. 
	
							
						
					Code:
	
	<inherits name="com.smartclient.theme.simplicity.SimplicityResources"/>
Code:
	
	Loading modules
   com.islandpacific.gui.IPGui
      Loading inherited module 'com.smartclient.theme.simplicity.SimplicityResources'
         [ERROR] Unable to find 'com/smartclient/theme/simplicity/SimplicityResources.gwt.xml' on your classpath; could be a typo, or maybe you forgot to include a classpath entry for source?
      [ERROR] Line 31: Unexpected exception while processing element 'inherits'
com.google.gwt.core.ext.UnableToCompleteException: (see previous log entries)
	at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:248)
	at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:413)
	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
	at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:274)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:501)
	at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:179)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1343)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2755)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
	at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:331)
	at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$100(ReflectiveParser.java:48)
	at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:402)
	at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:266)
	at com.google.gwt.dev.cfg.ModuleDefLoader$1.load(ModuleDefLoader.java:178)
	at com.google.gwt.dev.cfg.ModuleDefLoader.doLoadModule(ModuleDefLoader.java:294)
	at com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(ModuleDefLoader.java:147)
	at com.google.gwt.dev.DevModeBase.loadModule(DevModeBase.java:973)
	at com.google.gwt.dev.DevMode.loadModule(DevMode.java:482)
	at com.google.gwt.dev.DevMode.doSlowStartup(DevMode.java:372)
	at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1081)
	at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:795)
	at com.google.gwt.dev.DevMode.main(DevMode.java:282)
      [ERROR] Failure while parsing XML
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