ValueError: None of the available storage backends were able to support the supplied data format.
The actual issue was that I had loop edges (connecting nodes to themselves) which doesn't happen on the sample airport routes dataset. Removing those loops fixed the issue but a more clear error message would have saved me a couple hours.
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Thanks for filing this issue, that would indeed be helpful. It's not quite clear to me why loop edges shouldn't be supported so this might in fact be a bug but for now I've labeled the issue as an enhancement request.