Hi guys!

Currently I am trying to update my Magnolia CMS installation from 4.5 to 5.2.

I used the guide provided at 
'https://documentation.magnolia-cms.com/display/DOCS/10.+Migrate+from+4.5+to+5.2'
 and I think, that I followed all steps correctly.
The conversion takes place and Magnolia boots up. I can see the login and also 
log myself in.

Then the pages app is visible and the content in the tree... but I can't use 
the preview mode (edit mode). It just throws an exception:

WARN  info.magnolia.event.SimpleEventBus                : Exception caught when 
dispatching a class info.magnolia.ui.api.location.LocationChangedEvent event 
with class info.magnolia.ui.framework.app.AppControllerImpl eventHandler.
java.lang.ClassCastException: 
$java.util.LinkedHashMap$$EnhancerByCGLIB$$aae8cdca cannot be cast to 
info.magnolia.cms.beans.config.URI2RepositoryManager
        at 
info.magnolia.link.AbsolutePathTransformer.getURI2RepositoryManager(AbsolutePathTransformer.java:92)
        at 
info.magnolia.link.AbsolutePathTransformer.transform(AbsolutePathTransformer.java:78)
        at info.magnolia.link.LinkUtil.createAbsoluteLink(LinkUtil.java:357)
        at 
info.magnolia.ui.framework.i18n.DefaultI18NAuthoringSupport.createI18NURI(DefaultI18NAuthoringSupport.java:128)
        at 
info.magnolia.ui.framework.i18n.DefaultI18NAuthoringSupport$$EnhancerByCGLIB$$c7832058.createI18NURI(<generated>)

(full stacktrace at https://gist.github.com/DTrierweiler/4bd79590b82f9ffeb94a )

I searched on google and tried to find some information in the forums, but 
without success...
Probably someone here has an idea, what is going wrong there... Help would be 
really appreciated!

Thanks a lot in advance!
Best,
Daniel

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=0093fc31-f8f1-4b5b-b516-923853c8cc39


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