Marketplace Error Tracking & Alerts | Fix Issues with NetMarkets

The Real Cost of Marketplace Errors

Marketplace errors don’t just cause inconvenience, they directly impact visibility, revenue, and brand reputation. Take this real-world example from a Lengow case study: a retailer uploaded over 2,000 SKUs to a major marketplace. Due to undetected feed errors, only 18% of the products actually went live. No alerts were triggered, no warnings were issued – and by the time the issue was discovered, weeks of valuable sales had been lost.

These kinds of errors are more common than most teams realise. Without proactive tracking and real-time alerting, brands risk:

Hidden or suppressed product listings that don’t appear in search
Penalties or delisting by marketplaces due to recurring feed issues
Broken SEO, lost product rankings, and reduced ad performance
Hours spent combing through data to identify and fix issues manually
Missed sales windows during promotions, peak periods, or new launches

When a Marketplace Error Costs You Months of Sales

A retailer saw only 18% of its 11,000 products go live on Cdiscount due to poor marketplace strategy and listing errors. Even with expert support, it took six more months to fully activate the catalog, revealing the scale of the initial issues…

Key Features of NetMarkets Error Tracking

Real-Time Error Detection

Identify errors immediately at the feed or listing level – title too long, missing attributes, mismatched values, incorrect category, image issues, etc.

Instant Alerts & Notifications

Receive real-time alerts by email, dashboard or API when something breaks – before your team sees it in sales numbers.

Error Classification & Suggested Fixes

Classify issues by severity and root cause, with automatic suggestions to fix formatting, content, or mapping issues.

Error Reports by Channel & Catalog

Filter and prioritise errors by channel, product family, launch date or business impact.

4 Mistakes That Block Listings

NetMarkets helps you prevent all of these common errors, with built-in validation:

Missing mandatory fields (e.g. GTIN, brand, condition)
Incorrect or outdated categories
Improper use of marketplace-specific values
Too many SKUs pushed without testing

The Business Impact

Metric	Result
Average SKUs lost to feed errors	🔻 -65%
Time to detect & resolve issues	⚡ Real-Time
Listings fully validated on first upload	✅ +50%

“Before working with Lengow’s NetMarkets, it could take us months to launch new marketplaces – now it’s a matter of weeks. This has resulted in cost savings and a clear acceleration in our expansion within the marketplace channel.”

Pedro Salazar

Digital Director, Create

What are the most common marketplace errors, and why do they matter?

Marketplace errors can range from feed formatting issues and missing mandatory attributes to outdated stock data and invalid category mappings. These errors often result in listings being rejected, hidden, or even delisted entirely, which directly impacts your visibility and sales.

In the case of EfectoLED (company selling technical LED lighting), expanding across multiple marketplaces introduced technical challenges that affected product listings. By using Lengow to standardize their product data and monitor errors across channels, they gained full control over their catalogue and reduced time-to-market: a key factor in their growth across 10+ marketplaces in Europe.

How can I detect and resolve marketplace errors faster?

Manual checks and post-error reactions are not scalable. A powerful marketplace management platform like Lengow’s NetMarkets offers real-time validation, proactive error detection, and automated alerts – so you can fix issues before listings go live.

For example, when CREATE, Spanish design-led brand reinventing household appliances, expanded into cross-border marketplaces, they relied on Lengow’s error monitoring tools to keep their feeds compliant with local requirements. This allowed them to avoid launch delays, ensure listing accuracy, and maintain performance scores on each marketplace.

What’s the business impact of untracked marketplace errors?

Unchecked errors can lead to thousands of products staying offline without your team knowing, especially during launches or promotional events. The cost includes lost revenue, damaged marketplace rankings, and missed customer opportunities.

In one Lengow case study, a retailer listed 11,000 products on Cdiscount but only 18% went live due to feed errors. Without error tracking, the problem went unnoticed for weeks. Even with expert support, it took six additional months to fully recover the catalog – underlining how critical early error detection truly is.