Hi buzzzr,
thanks for reaching out.
If you see that warning, it means that you are using an ad blocker. This is an add-on to your browser or part of a firewall or anti-virus software that blocks ads on a website.
In most cases, you or someone else installed an add-on like AdBlock (Plus), ublock or ghostery in your browser.
Ad blockers can cause problems while using Advanced Ads in the backend. I would, therefore, advise disabling that add-on for your own website.
Advanced Ads comes with a couple of features to enable ads for visitors to your website who might use such an ad blocker. See this page for more information.
Please let me know if you need anything else.
Thomas