Doesn’t support generateblocks/container

I’m old and don’t do a lot of WP any more. Mostly, I log in and change a price every few months. This time I can’t edit the home page and get the does not support generateblocks/ container.

I think I’ve gone through the basics – deactivated and tested every plug in, uninstalled generateblocks and reinstalled. Same issue. I have GP Premium installed and have been a user for a long time. Generate Blocks Pro is installed but not activated, as I’m not a licensed user.

Any help would be greatly appreciated.