Your product did not reach Etsy, and Shuttle could not tell what went wrong. You can see this after a transfer or an update to Etsy.
Why it happens
Etsy had a short problem. Etsy did not answer, or did not confirm the listing after Shuttle sent it. Check if other products failed at the same time. If they did, this is the most likely cause.
Etsy refused the product without a reason Shuttle knows. If this one product fails every time while others go through, the cause is most likely something in this product.
Something went wrong inside Shuttle while it worked on the product. This is usually temporary too.
How to fix it
Wait a few minutes.
In Shuttle, open the Products page and find the product.
If the product is not on Etsy yet, click Transfer to Etsy.
If the product is already matched, click Update, then choose Update in Etsy. On the Shopify → Etsy tab, the button already says Update in Etsy.
If many products failed in the same run, start a new run instead. Click Start a bulk transfer, then Transfer to Etsy. For updates, click Start a bulk update, then Update in Etsy.
Still seeing it?
Contact us through the chat bubble if:
the same product fails again after a few tries, or
every product fails.
Tell us the product name and about when it failed, so we can look into it.