Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Without access to the website, we can’t know for sure what’s causing this, but it’s likely that some other plugin on your website is using an outdated version of the CMB2 library that is conflicting with the version we use in Rank Math.
We use the latest version or one of the latest, but if a plugin uses an older one and it’s not being updated it will cause this message to appear.
What we recommend you do is a plugin conflict check by following this tutorial and find the culprit: https://rankmath.com/kb/check-plugin-conflicts/
After you find the one causing this issue please report to the developers of that plugin and ask if they are using the latest version of the CMB library.
Hope this helps solve your issues.
Don’t hesitate to get in touch if you have any other questions.
Hi,
Thank you for your answer.
I installed the latest version of CMB2. Disable and Remove it the issue still have.
This issue maybe have with CMB2.
Thanks
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.
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.