Error after installing WordPress 6.6.2

I’ve never seen it. But for me it indicates an incomplete installation. I would recommend installing the core files again: https://www.ads-software.com/documentation/article/updating-wordpress/#manual-update

HI @nich123,

Hope you are doing well.

It looks like something went wrong with updating WordPress. This might happen in some odd cases. As you know, ‘wp-includes’ is the folder in WordPress that stores core files. ‘Uncaught Error: Failed opening required’ implies that some files required to run WordPress smoothly are missing. If we look at the error, we can understand that some files related to the block editor are missing. Let me provide some recommendations to solve this issue.

Downgrading the WordPress version is best in situations like this. You can do it through Softaculous if you are using C Panel. Also, you can consider restoring the most recent backup if you have any.

Ref.: https://www.inmotionhosting.com/support/product-guides/softaculous/softaculous-update-rollback/

Try updating again to the latest version of WordPress.

Let me know how it goes.

Best Regards
Muhammed Jazeel

This issue was on the hosting side. i was able to update once they took care the issue on their end.