I believe I set it up. At the very least, everything appears as it should. I'm just trying to figure out why I keep getting that float error.
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Is it possible that your attributes do not have `default` attributes set up, such that `show tau` with no additional attributes would show nothing at all? That's an issue with the crop tool, as it only uses the provided image tag (e.g. `tau`) for cropping purposes. Your layered images should always have sensible `default` attributes set if they're required (e.g. a default mouth attribute because the character should always have a mouth). It looks to me in the screenshot like if you don't have a `tbase` attribute set, the sprite simply doesn't have a base at all and is made up of the hair/arms/expression parts, which supports this. You can set up attributes with the `default` keyword e.g.
group tbase auto: attribute casual default
Oh my gosh, thank you so much for telling me about this! You see, I had been working with pre-rendered sprites for so long that layered images are still new to me. I knew it was something on my end, but I was able to implement a default attribute set. Thank you very much for your help! You've done a great job with all these tools, and I feel like I've been able to do a lot more creative things in my game thanks to them.