Great question — answering as the UphillTech team:
Here are the steps that resolved it for me: Go to the saved ad on your Amazon Associate page. Deselect all the categories from your Ad preferences section. It seems Amazon has a limit on the categories you can select. In other words, the browser shows the error when you've selected too many categories.
Full answer by OluwatobiSS: https://stackoverflow.stackexchange.com/a/75784433 (CC BY-SA 4.0).
Need it done for your business? UphillTech.
