"Plugin failed to connect to hosted mode server" error message

I created my first GWT project, and I'm getting this error. The
StockWatcher application in the tutorial worked fine--no problems.
I've read all related posts in this group and tried every suggestion,
but without success. I tried changing the url from 127.0.0.1 to
localhost, and I've tried using -bindAddress.

I have noticed that I don't get the error when I reference standard
packages (the Java Libs and GWT libs). If I reference a class in my
project I get the error. For example, this works:

AbsolutePanel panel = new AbsolutePanel();
panel.setSize("200px", "120px");
panel.addStyleName("mainPanel");
Label label = new Label("Label");
label.setWidth("100px");
panel.add(label, 50, 50);
RootPanel.get("main_window").add(panel);

but this doesn't:

AbsolutePanel panel = new AbsolutePanel();
panel.setSize("200px", "120px");
panel.addStyleName("mainPanel");
MyWidget myWidget = new MyWidget()
panel.add(myWidget, 50, 50);
RootPanel.get("main_window").add(panel);

So, it seems as if the plugin is not finding my compiled code? I'm
totally stumped with this and any help would be appreciated.

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