Hi Antonio Cuinica,

The error message you're encountering indicates that your website's JavaScript code is trying to access a DOM element using querySelector, but it is finding null instead. This typically means that the element your code is trying to access does not exist on the page at the time the script runs.

Review the JavaScript code that is causing the error. Look for any querySelector calls and ensure that the selectors are correctly targeting existing elements on your webpage. Ensure that the elements you are trying to select actually exist in the DOM when the script runs.

Hope it helps.