Hey Nam, It sounds like you've already made good progress by installing the Meta Conversion API, but the error you're seeing could be due to various factors like improper event configuration or missing parameters.

Here’s a quick breakdown: 1. Access Token – Make sure your access token is set up correctly. 2. Check Event IDs – Ensure you're sending unique Event IDs to avoid duplicates. 3. Set Up Server Event Match – Double-check if the server events are properly matched with your pixel events.

Please tell me, How did you install "Conversion API" ? Is it via Google Tag Manager or any other way? What type of error have you encountered and Which CMS are you using for website?

You can share your website URL. It would be easy to initiate a audit and give you a proper guideline.