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critical 308

Error 308 — Invalid category/listing type combination

What this means

You cannot select an Adult Only category for a Fixed-Price item.

Why this happens

Every eBay listing must be in a valid leaf category — not a parent or deprecated category. eBay periodically retires categories, so old listings or templates may reference IDs that no longer exist.

How to fix it

  1. Look up your product's leaf category at eBay → Seller Hub → Listing Tools → Category Lookup.
  2. Use the GetCategories API call (Trading API) or the Sell Catalog API to validate category IDs programmatically.
  3. Don't list at the parent level — eBay redirects buyers to the leaf category and may block parent-level listings.
  4. If the category was deprecated, eBay's listing tool will suggest a successor — use that instead.

Common pitfalls