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

 
A3020 replied on at Permalink Reply
A3020
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
hutman
What version are you upgrading from?

Here are the manual upgrade instructions -https://documentation.concrete5.org/developers/installation/upgradin...