Overview

Sellers who rely on bulk uploads sometimes encounter Error 99051 when Amazon rejects a flat‑file submission because the template used has been retired. The error appears during the upload process and halts any new listings or updates contained in that file. Promptly fixing the issue is essential to keep product launches and inventory refreshes on schedule.

Key Points

• Root cause — The upload references a template version that Amazon has deactivated after a recent update.
• Immediate consequence — All rows in the file are ignored until the seller resubmits using a currently active template.
• Simple remedy — Download the latest flat‑file for the relevant category from Seller Central and re‑upload the data.
• Data validation — The new template includes a “Valid Values” sheet; every dropdown field (e.g., color, size) must match the listed options.
• No account penalty — The error does not affect account health, but it can delay time‑sensitive listings.

How to Resolve Error 99051

1. Locate the current template — In Seller Central, open Inventory > Add Products via Upload > Download Template and select the exact category of the items you are uploading. For example, a seller adding kitchen gadgets would choose the “Home & Kitchen – Kitchen & Dining” template, which is always the most recent version.
2. Transfer product data — Open the freshly downloaded Excel file and copy your product rows from the old file into the new one. Align each column with the updated header names; if the old file used “Item Weight (kg)” and the new file now calls it “Package Weight (kg)”, adjust the column accordingly.
3. Validate against the Valid Values sheet — Switch to the “Valid Values” tab and cross‑check every entry that uses a predefined list (e.g., “Material Type” must be one of Plastic, Stainless Steel, Glass). Replace any mismatched values—changing “Silver” to the accepted term “Silver‑Plated” if required.
4. Run a test upload (optional) — Use the “Check Your File” feature in Seller Central to preview errors before the final submission. If the system flags a row, correct it in the spreadsheet and re‑run the check.