Shuttle tried to update this product's stock on Etsy, but none of the listing's variations were left to update, so it skipped the update.
Why it happens
Your Etsy → Shopify variation settings decide which Etsy variations Shuttle skips. Shuttle also uses them when it updates stock on Etsy. You see this error when these settings, taken together, skip every variation of the listing:
Exclude variations by name. Your list covers every variation of this listing. One name can do this, or several names together. For example, "Red" and "Blue" on a listing sold only in Red and Blue. A name with a * in it matches any variation that contains the rest of the name, so it can catch more than you meant.
Only export visible variations. Shuttle skips variations that are hidden from buyers on Etsy. If every variation your name list doesn't already skip is hidden, there is nothing left.
How to fix it
In Shuttle, go to Settings > Products > Etsy → Shopify and find the Product Variations section. These settings only show while Include variations is turned on.
Under Exclude variations by name, compare your list with this listing's variations on Etsy. Remove names until at least one of the listing's variations is no longer covered.
Under Visibility, check whether Only export visible variations is on. If it is, make at least one remaining variation of the listing visible on Etsy, or turn the setting off.
Click Save.
These settings also control which variations Shuttle transfers from Etsy to Shopify, so change only what this listing needs. After you save, Shuttle updates the listing's stock the next time it syncs this product.
Still seeing it?
If your settings no longer skip every variation of this listing and the error still appears, contact support. Include a link to the Etsy listing.