WAAttributeNotFound raised on #scriptGeneratorClass

Hi all, Using Monticello browser, I just updated a standard 1.2 Pier image to the latest versions of Pharo (PharoCore1.0-#10517), Seaside 3 and Pier 2. During the update process, WAAttributeNotFound was raised upon the call to #preferenceAt: #scriptGeneratorClass put: aClass by the following methods: - JQAllFunctionalTests class >>initialize - JQUiAllFunctionalTestsclass >>initialize - SUAllComponentTestsclass >>initialize - SUAllFunctionalTestsclass >>initialize I had to bypass the issue by temporarily the code of those methods. Now, the same exception is raised again, when trying to connect to Pier via the local host (<http://localhost:8080/pier>http://localhost:8080/pier), upon the call to *self handler configuration at: #scriptGeneratorClass*, in WARequestContext >> newDocument. #newDocument has been changed on Feb, 22, 2010. Does anybody see how this issue could be better fixed; just reverting to the previous code doesn't seem a good idea. Thanks in advance, Reza