Sudden erron in Protégé 4 .1 and 4.2

Hello,

I was using Protégé fine until yesterday and today when I opened my
ontology it show this message trying to see the classes:

An error occurred whilst creating the view.
ConcurrentModificationException
null

Any help to solve it greatly appreciated.

Thanks,

-- 
Andre Luiz Tietbohl Ramos
http://www.feng.pucrs.br/~andreltr 

"The best way to cheer yourself up is to try to cheer someone else up."
Mark Twain

I want a feeling worth paying for before I say goodbye...
Matt Johnson

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