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I was returning the wrong response type in my callback. My service semantically returns nothing, which apparently means I have to return EmptyResponse()...

I was returning the wrong response type in my callback. My I was returning the auto-generated MyServiceResponse object for my service's srv file. Even though my service ~~semantically returns nothing, which~~ has no return types, this apparently means ~~I have~~ something's still returned. The fix was to to return EmptyResponse()...

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