Overview

Error 90029 is a common Seller Central file upload error that occurs when a required column is missing from your feed file or when a column heading is invalid. Understanding how to resolve this error quickly can save sellers significant time and prevent listing delays when managing inventory through flat file uploads.

Key Points / What Sellers Need to Know

• Missing required columns trigger this error - If your upload file is missing a column that Amazon considers mandatory for that particular feed type, Error 90029 will appear and your file will not be processed.
• Invalid column headings also cause this error - Even if all required columns are present, a misspelled or incorrectly formatted column header will be flagged as invalid and block your upload.
• Template downloads are the safest fix - Amazon recommends downloading a fresh copy of the feed template to ensure all required columns and correct headings are included.
• Manual correction is also an option - Experienced sellers can add the missing column or fix the invalid heading directly in their existing file without starting over from a new template.

Common Causes

This error typically surfaces when sellers modify flat file templates by accidentally deleting required columns, renaming column headers, or using an outdated version of a template that no longer matches Amazon's current requirements. It can also occur when sellers build their own upload files from scratch rather than starting from an official Amazon template. Column headers are case-sensitive and must match Amazon's expected format exactly, so even small deviations such as extra spaces, different capitalization, or slight misspellings will trigger the error.

How to Fix the Error

There are two primary approaches to resolving Error 90029. The first and most reliable method is to download a fresh copy of the appropriate template directly from Seller Central. Navigate to the inventory file upload section, select your product category, and download the latest template. You can then transfer your product data into this new file, ensuring all required columns remain intact. The second approach is to manually correct your existing file by identifying which column is missing or which heading is invalid, then adding or fixing it to match the expected format. If the error message specifies a particular column name, use that exact name as your column header.