On Monday, July 23, 2012 9:43:49 PM UTC+1, Tommy Pollák wrote:

The clue is this


ActionDispatch::Session::SessionRestoreError 
Session contains objects whose class definition isn't available. Remember 
to require the classes for all objects kept in the session.
(Original exception: uninitialized constant 
ActionController::Flash::FlashHash [NameError])


The session contains serialised ruby objects and in this instance contains 
an object that rails couldn't deserialize. If my memory is correct, 
ActionController::Flash::FlashHash was the name of the class that held the 
session values in older versions of rails - it looks like you might have 
accidentally upgraded rails. Clearing out sessions should fix this, 
although the upgrade might of course cause problems elsewhere.

Fred

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