No sellers.json in the cache for this hop
The local cache has no sellers.json for this node's asi, so the hop cannot be authorised.
What it means
Opt-in --resolve looked up sellers/<asi>/sellers.json in the local cache and found no file. The core already checked that asi is a bare domain; this finding means that domain's sellers.json was not cached.
Why it matters
A hop that cannot be looked up cannot be authorised. Buyers that verify SupplyChain against sellers.json treat a missing file as an unverifiable node and drop or discount the path.
How to fix it
Fetch https://<asi>/sellers.json into the cache as sellers/<asi>/sellers.json, then re-run with --resolve --cache. If the advertising system does not publish sellers.json, the node cannot be authorised.
Example that trips it
rtblint validate --resolve --cache ./supply-cache request.json
Fires when a payment node's asi has no sellers/<asi>/sellers.json in the cache directory.
Check your payload
Paste a bid request or response into the tester to see whether this code fires against it, or gate on the id in CI with the CLI: the id is stable, wording is not.
Back to the full diagnostic code reference.