GWT - The response could not be deserialized

[Pippo Baudone]

i am in this situation:

@RemoteServiceRelativePath("create_event") 
public interface CreateEventService extends RemoteService { 
    String[] createeventServer(LinkedList<LinkedList<String>> input) throws 
IllegalArgumentException; 
}



public interface CreateEventServiceAsync {
    void createeventServer(LinkedList<LinkedList<String>> input, 
AsyncCallback<String[]> callback) throws IllegalArgumentException;
}



public class CreateEventServiceImpl extends RemoteServiceServlet implements 
CreateEventService {
    public String[] createeventServer(LinkedList<LinkedList<String>> input) 
throws IllegalArgumentException { 
        String[] arr = new String[2];
        ... return arr;
    }
}



Why does this cause error "*The response could not be deserialized*"?

p.s. I have tried to execute the project with app engine and without it, 
but the problem is the same.

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