Hello!
Thank you for posting in the Apple Support Community.
This error message is indicating that your iPhone XR cannot verify the security certificate of the site "personalopo.club". Websites use security certificates to establish secure, encrypted connections. If a website's certificate cannot be verified, it might mean that the website is not secure, and could potentially be malicious.
The site in question, "personalopo.club", may be a malicious site attempting to gain unauthorized access to your data. Be cautious about providing any personal information or clicking any links associated with this site.
If you're seeing this error pop up frequently, and not just when you're visiting a specific site, it could be an indication of adware or other types of malware. Adware can sometimes redirect you to websites you didn't intend to visit and display these kinds of error messages. In this case, you may need to remove the adware. This might be as simple as deleting a recently installed suspicious app, or you may need to take more drastic measures like a factory reset of your device. Before doing a factory reset, remember to back up any important data.
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Thanks!