Hi,
I am using a template I brought that runs on Joomla 4.4.8 and I am using PHP 8.1 on my cPanel. When I look at SP Page Builder Pro/Pages it goes to a red screen with the above error. I have tried reducing the PHP version to the same error. The front end works fine. Any other menu selection works fine. I am running SP Page Builder Pro Version 3.8.9. From memory I installed the latest version with no issues and still got the error above. I have since had to reinstall the, page, Akeeba, and back to this stage with the error.