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Ok, digging back through my memory, I believe this is because it was starting a gateway with default settings to look for a hub on localhost, and also via zeroconf. If the localhost hub was found (which it did for chatter_concert), then zeroconf discovery would throw this warning when it would discover the same hub.

This has been updated on the hydro-devel/indigo branches so that it doesn't do this double lookup.

In short, don't worry about it :)

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