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System Error by click on version history

Question asked by nadja on Sep 23, 2008

May be someone could help me…

I have got some system error by clicking on version history…
It says ….
javax.faces.FacesException: Cannot get value for expression '#{DialogManager.bean.versionHistory}'
caused by:
org.apache.jasper.JasperException: Cannot get value for expression '#{DialogManager.bean.versionHistory}'

What does it mean? and how can I avoid that.
I m trying to test Alfresco functions for the use as DMS in our company.
For the first I did the installation with Derby database on Windows 2000

May be its wrong? and I should use MySQL?
Later on Alfresco should run on Linux

Thanx for answering