This is caused by using the old 8.1.x version of GWT Designer. This is
also discussed in the release notes...

    http://code.google.com/webtoolkit/release-notes.html#Release_Notes_2_2_0

Uninstall GWT Designer 8.1.x (which is not compatible with GWT 2.3.1)
and use the version of GWT Designer integrated with GWT/GPE 2.3.1. To
uninstall, go to "Help > About > Installation Details > Installed
Software", select all of the GWT Designer v8.1.x components
(everything with a 8.1.x version tag), and click "Uninstall".

On May 11, 8:34 am, cri <chuck.irvine...@gmail.com> wrote:
> Workaround found. First, uninstall all GWT/Windowbuilder plugins.
> However, for me, this wasn't sufficient. After uninstalling plugins,
> search your eclipse workspace ".plugins" directory for all files
> matching *google*, i.e. files with filenames containing "google".
> Finally, reinstall GPE. This fixed the problem for me.
>
> On May 11, 9:33 am, cri <chuck.irvine...@gmail.com> wrote:
>
>
>
>
>
>
>
> > I just installed the update to GPE. I'm at 2.3.1. Now I can't open any
> > gui classes with GWT Designer. Even if I create a vanilla project form
> > scratch using "New Web Application Project" I get the same result.
> > This is really disappointing! Okay, how the heck to I get back to the
> > previous version of GPE? Message in eclipse below. Should be very easy
> > to reproduce....
>
> > [ERROR] Element 'extend-property' beginning on line 27 contains
> > unexpected attribute 'fallback-value'
>
> >                [ERROR] Failure while parsing XML
>
> >                [ERROR] Unexpected error while processing XML
>
> >             [ERROR] Line 21: Unexpected exception while processing
> > element 'inherits'
>
> >             [ERROR] Failure while parsing XML
>
> >             [ERROR] Unexpected error while processing XML
>
> >          [ERROR] Line 18: Unexpected exception while processing
> > element 'inherits'
>
> >          [ERROR] Failure while parsing XML
>
> >          [ERROR] Unexpected error while processing XML
>
> >       [ERROR] Line 18: Unexpected exception while processing element
> > 'inherits'

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