Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
Please clear the cache from your caching plugin, and if you are using a CDN, clear the cache from there as well.
That should fix the issue.
Let us know if the issue persists.
We are here to assist you.
We have cleared Cloudflare cache and local server cache and still the same error.
Likewise, before opening the case, we already tried incognito and whether to cache the content.
We look forward.
Thank you
Hello,
In this case, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.