Tutorial Apps not working on orbeon 3.7, firefox 3.0 on Ubuntu Linux server 2.6

> Hello,
> I am trying to run orbeon 3.7 beta on tomcat 5.5.26 on linux  
> server(ubuntu
> version 2.6.24), sun java version 1.5.0 and FireFox version 3.0.1.
>
> The welcome page comes up okay but when I click on the Xforms Hello  
> or Any
> other links, the page gets loaded with this error and at the bottom  
> of the
> page, the content of the examples
> But if I type in something to the text box(for the XForms Hello  
> example) and
> hit enter, nothing happens
>
>>>
> Loading...
> An error has occurred
> You may want to try one of the following:
>
> Close this dialog and continue to use this page.
> Reload this page. Note that you will lose any unsaved changes.
> If the above does not work, try reloading the page yourself. Note  
> that you will
> lose any unsaved changes:
>
> With Firefox and Safari: hold down the shift key and click the  
> Reload button in
> your browser toolbar.
> With Internet Explorer: hold down the control key and click the  
> Reload button
> in your browser toolbar.
> Return home.
>
>>>
>
> Orbeon.log contains these errors
>
>>>
>
> 2008-08-27 11:55:22,360 INFO ProcessorService - /welcome/ - Received  
> request
> 2008-08-27 11:55:26,196 INFO ProcessorService - /welcome/ - Timing:  
> 3864 -
> Cachehits for cache.main: 292, fault: 94, adds: 94, expirations: 0,  
> success
> rate: 75%2008-08-27
> 11:55:29,667 INFO ProcessorService - /xforms-hello/ - Received request
> 2008-08-27 11:55:31,539 INFO ProcessorService - /xforms-hello/ -  
> Timing: 1872 -
> Cache hits for cache.main: 416, fault: 60, adds: 59, expirations: 0,  
> success
> rate: 87%
> 2008-08-27 12:02:32,149 INFO ProcessorService - /xforms-bookcast/ -  
> Received
> request
>
> 2008-08-27 12:02:33,092 WARN Descriptor - Giving up unable to read  
> descriptor
> file from /var/lib/tomcat5.5/webapps/orbeon/WEB-INF/descriptor.xml
>
> 2008-08-27 12:02:33,094 WARN Descriptor - Giving up unable to read
> descriptor.xmlfile from classloader in package org.exist.http
>
> 2008-08-27 12:02:33,162 ERROR XFormsServer - XForms - submission -
> xforms-submit-error throwable:
>
> org.orbeon.oxf.xforms.XFormsModelSubmission
> $XFormsSubmissionException: line 27
> of oxf:/config/xforms-widgets.xsl (processing submission response):
> xforms:submission for submission id:
>
> list-submission, error code received when submitting instance: 404
>
> oxf:/config/xforms-widgets.xsl, line 27, column -1:  
> xforms:submission for
> submission id: list-submission, error code received when submitting  
> instance:
> 404
>
> at
> org
> .orbeon
> .oxf
> .xforms
> .XFormsModelSubmission
> .performDefaultAction(XFormsModelSubmission.java:1102)at
> org
> .orbeon
> .oxf
> .xforms
> .XFormsContainingDocument
> .dispatchEvent(XFormsContainingDocument.java:1283)at
> org
> .orbeon
> .oxf
> .xforms
> .action.actions.XFormsSendAction.execute(XFormsSendAction.java:51)at
> org
> .orbeon
> .oxf
> .xforms
> .action
> .XFormsActionInterpreter
> .runSingleIteration(XFormsActionInterpreter.java:230)at
> org
> .orbeon
> .oxf
> .xforms
> .action
> .XFormsActionInterpreter.runAction(XFormsActionInterpreter.java:190)at
> org
> .orbeon
> .oxf
> .xforms
> .event
> .XFormsEventHandlerImpl.handleEvent(XFormsEventHandlerImpl.java:184)at
> org
> .orbeon
> .oxf
> .xforms
> .XFormsContainingDocument
> .dispatchEvent(XFormsContainingDocument.java:1264)at
> org
> .orbeon
> .oxf.xforms.XFormsContainer.initializeModels(XFormsContainer.java:
> 173)at
> org
> .orbeon
> .oxf
> .xforms
> .XFormsContainingDocument.initialize(XFormsContainingDocument.java:
> 1525)
>
> .........................
> ---------
>>>
>
> Any idea what could be the problem?
> Thanks
> Jose
>
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