Have you looked at your server logs? What's the status code? (use Firebug or whatever to see what the server responds: 404 → the RemoteServiceRelativePath is wrong and/or you have an issue in how you deployed your app; 500 → there was another error on the server, maybe you reached a non-RPC servlet; 405 → you reached something that doesn't accept POSTs, so it's not your RPC servlet)
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