Fatal error when activating Rank Math SEo Pro PLugin.

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.

You mentioned that you’re installing the Rank Math PRO plugin, but the account you have used to open this ticket is the Rank Math free version.

Can you please search and forward a receipt from FastSpring.com or the email address you used to purchase so we can locate your account and verify it?

Meanwhile, please follow these steps to fix the issue:
https://rankmath.com/kb/fatal-error-after-1-0-49-update/

You can follow only the first 2 steps and clear your caches. The following steps mentioned in the article are for advanced users.

Looking forward to helping you.

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/

Looking forward to helping you.

Thank you.