After updating to WordPress 6.4.2 all pages are showing blank

I,
Purchased a new license for this Woodmart theme and imported the demo. I designed the website and made all the changes. However, as soon as I upgraded to WordPress 6.4.2. all teh pages are now showing blank on the front end. When I try to edit the page in wp-bakery page builder it gives me this error “This page can not be edited with WPBakery since it is missing a WordPress default content area.” Please see the attached screenshot. I am very anxious as my whole work will be lost if I had to restore. I also tried to restore the wordpress to previous version by replacing the wp-admin, wp-includesfolder and all the files in wordpress root folder. The problem is still, there.