> is there any one that has ever met this error?
Yep, we all see them during development.

> what should I do to solve it?
Do what the exception say's: look in the server log....

Tip: make sure your backend runs well without using gwt. Test your backend 
through unit tests that will catch the above errors.
If you throw checked exceptions to the front end you will get more 
exception details in the client btw.
See GWT doc for more info.

- Ed

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