Website shows error message after 8.2.x upgrade

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HI everyone,
I'm hoping someone has seen the following error message before. I got it after updating to 8.2.1..

An unexpected error occurred.
Class \Concrete\Core\Permission\Key\CategoryTreeNodeKey does not exist

I've tried putting a new concrete folder in , I've tried to upload my backup via FTP and I've even tried running the update via ssh. Does anyone have any idea how to fix this error

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A3020 replied on at Permalink Reply
I haven't seen this error before. I'd suggest moving the 821 core back into place and then clearing the C5 cache + opcache.

Of course you should also verify if that file exists in /concrete/src/Permission/Key/CategoryTreeNodeKey.php
hutman replied on at Permalink Reply
What version are you upgrading from?

Here are the manual upgrade instructions -