This looks similar to a problem that I had. You might try the
workaround described at 
https://mail.google.com/mail/?shva=1#inbox/12fe00abafca9f0f

On May 11, 11:08 am, Juan Pablo Gardella <[email protected]>
wrote:
> Desintall all plugin related to GWT in eclipse and reinstall.
>
> 2011/5/10 Swami <[email protected]>
>
>
>
>
>
>
>
> > Hello, I built & ran an Eclipse project (with ant) successfully using
> > 2.2. After upgrading to 2.3, I'm getting errors even when falling back
> > to 2.2. Running ant on a Gnome shell is fine.
>
> > I'm new to GWT; thanks for any help.
>
> > Starting HTTP on port 8888
> > Loading inherited module 'com.google.gwt.user.User'
> >   Loading inherited module 'com.google.gwt.canvas.Canvas'
> >      Loading inherited module 'com.google.gwt.canvas.dom.DOM'
> >         Loading inherited module 'com.google.gwt.dom.DOM'
> >            Loading inherited module 'com.google.gwt.user.UserAgent'
> >               [ERROR] Element 'extend-property' beginning on line 27
> > contains unexpected attribute 'fallback-value'
> >               [ERROR] Failure while parsing XML
> > com.google.gwt.core.ext.UnableToCompleteException: (see previous log
> > entries)
> >    at
>
> > com.google.gwt.dev.util.xml.DefaultSchema.onUnexpectedAttribute(DefaultSche 
> > ma.java:
> > 72)
> >    at
> > com.google.gwt.dev.util.xml.Schema.onUnexpectedAttribute(Schema.java:
> > 80)
> >    at
> > com.google.gwt.dev.util.xml.Schema.onUnexpectedAttribute(Schema.java:
> > 80)
> >    at com.google.gwt.dev.util.xml.ReflectiveParser
> > $Impl.startElement(ReflectiveParser.java:228)
> >    at
> > org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
> > Source)
> >    at
> > org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
> > Source)
> >    at
>
> > org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unkn 
> > own
> > 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.xerces.jaxp.SAXParserImpl
> > $JAXPSAXParser.parse(Unknown Source)
> >    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:
> > 280)
> >    at ...
>
> > --
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