help with css bundles and background image sprites

Hi,

I'm trying to use a css bundle with a background image reference and I
am getting an error in the Development Mode Eclipse view: Fix by
adding String accessor method(s) to the CssResource interface for
obfuscated classes, or using an @external declaration for unobfuscated
classes.

When I add an @external at-rule I no longer receive the error but the
background image doesn't show up. More specifically, I do see all
other css attributes when inspecting the DOM but just not the
background-image attribute.

Here is my code (snipped for readability)

--- CSS file
@sprite .error {
gwt-image: 'error';
}

.errorMessage {
background-color: #FEEFB3;
gwt-image: 'warn';
}

-- Client Bundle
public interface MessagePanelClientBundle extends ClientBundle {

@Source("message-panel.css")
MessagePanelCSS css();

@Source("error.png")
ImageResource error();
}

-- Css Bundle
public interface MessagePanelCSS extends CssResource {

String errorMessage();
}

Does anyone have any ideas as to why this might happen? Any help
would be appreciated. Thanks.

Joe

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