This error message unfortunately doesn't apply to all cases in which you end up without a `layerGroup`. For example, you could select an artboard and still get the naming advice for a layer. To avoid additional complexity, I suggest changing it to "Make sure you've selected a symbol, or a layer that belongs to one before you try to sync."

I like the naming advice, but I think that problem will be addressed when I get to the enhancements from #6.