Hi,
I had an issue with Yoast and it was resolved in ticket "#5492 Yoast SEO plugin is preventing changes using page builder"
However the day after I was not able to login into my website the attached error is displayed. I did a restore of the site and that fixed the problem but the following day the same thing happen again.
Please help! I am geeing frustrated, if it is not one thing it's a next
How did you resolve your issue?
My files are backed up so I did a restore to previous date
Take a look
here
Hope this help
The X Learner
Are you facing the issue with version 1.9.9 as well ?