Hi Moritz,

Could you try the following:
- In your project properties, could you see what the App Engine SDK is set
to (right-click project > Properties > Google > App Engine).  Does it show
an error on this page?  If you click the Configure SDKs button, what is the
path for the SDK?
- In your project properties, can you go to Java Build Path , then Libraries
tab, and see if there are any leftover JARs on your classpath?  If there
are, could you take a screenshot of that dialog (hopefully tall enough so
all the entries are visible)?

Thanks,
jason

On Mon, Mar 29, 2010 at 1:53 AM, Moritz <mor...@cloudme.org> wrote:

> I have the same problem: "The App Engine SDK '/{project-root}/war' on
> the project's build path is not valid" where "{project-root} is the
> root directory of my project.
> When I create a new project, this error does not occur, but I cannot
> spot any differences in the configuration files of both projects, so
> I'm a bit stuck at the moment.
>
> On 29 Mrz., 04:07, Joa <joachim.pfeif...@gmail.com> wrote:
> > I've tried to update GAE to 1.3.2. Now the project is broken and I
> > seem to be not even able to revert back to 1.3.1.
> >
> > I've taken the following steps:
> > - Trying to locate instructions. Couldn't find any, so this must be
> > simple...
> > - Updated Google plugin through Help -> Check for updates. Checks out
> > - Then downloaded GAE 1.3.2 for Java, unzip
> > - Set Project Properties using Google > App Engine. "Use specific SDK"
> > set to 1.3.2. Now the project root in the Eclipse Package Explorer is
> > marked with an error. The project won't start any longer without an
> > error message and dumps stack traces. To my dismay, any changes in
> > this panel do not seem to have an impact whatsoever now.
>
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