Navigation Canceled

I used gwt for one project more than one month without any problems.
Yesterday, I worked it. It was OK. I closed project and run it after
several minutes. But I saw Navigation Canceled in localhost. I use
windows vista. But I don't think it is related to my operating system.
I did reset internet explorer setting, I reinstall firefox. But the
problem is not resolved.
Would you please help me?

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