Overview

Amazon sellers frequently encounter error 90009 when uploading inventory flat files through Seller Central. The error appears when the file’s header row is missing, altered, or corrupted, preventing Amazon’s system from reading the data. Fixing the issue quickly is essential to keep product listings, price updates, and stock changes flowing without interruption.

Key Points

• Root cause — The system flags error 90009 whenever the hidden header row that sits above the column titles is absent, damaged, or edited in any way.
• Header row role — This hidden row carries metadata that tells Amazon’s processing engine how to interpret each column; it must remain exactly as Amazon provides it.
• Fastest remedy — Downloading a fresh template from Seller Central and copying only the product rows into that clean file resolves the problem in most cases.
• Required format — After correcting the file, it must be saved as a tab‑delimited text file (.txt); saving as .csv or .xlsx will trigger the same error.
• Common trigger — Accidentally deleting or moving the header row while using Excel, Google Sheets, or similar tools is the leading way sellers run into this issue.
• Impact scope — The error blocks bulk uploads, which can delay new listings, price adjustments, or inventory updates, especially during high‑traffic periods.

How to Fix Error 90009

1. Obtain a clean template — Log into Seller Central, navigate to Inventory → Add Products via Upload, and click Download Template. For example, a seller of home décor items would download the “Inventory Loader” template that matches their product type.
2. Transfer product data only — Open the fresh template in a spreadsheet program, locate the rows that contain actual product information (usually starting at row 3), and copy them from the original file. Paste the data into the new template without touching rows 1‑2, which hold the hidden header and column titles. A seller updating 1,200 SKUs would copy the entire data block, ensuring the top two rows stay untouched.