I've seen this before. To fix it, just go to properties for the project, 
open the 'Google' section, then select 'Web Toolkit'. Change to 'Use 
specific SDK' and then pick a valid one. If there are no valid ones, just 
add the path manually in 'Configure SDKs'.

At least, that's always worked for me.

On Saturday, July 28, 2012 12:58:57 AM UTC+2, Chris wrote:
>
> I just updated eclipse and now all GWT projects are broken.  I inspect the 
> installation and I see everything is installed, the problem is that:
>
> *All my run configurations are gone
>
> *There is no option to run anything as Web Application.
>
> *Error log includes:  
>   -Unable to restore perspective: Workspace - Java.
>   -Problems occurred when invoking code from plug-in: 
> "org.eclipse.ui.workbench".
>
> *Errors in build path:
> [Persisted Container]
>  "com.google.gwt.eclipse.core.GWT_CONTAINER"
> gwt-user.jar (missing)
> gwt-dev.jar (missing)
>
>
>
> Can anyone offer a suggestion what I might do to fix this? 
>
> What is a persisted container?
>
> Is there a roll-back mechanism in Eclipse?
>
>  
>

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