I’ve upgraded my company’s site from 4.5.1 to 5.3.4, and I’m receiving the message “The requested group does not exist or you do not have permission to view it” when I go to the forums, whether I’m logged in as administrator or not.
Looking at the Integration | Locations page, I see that the custom icons folder is not found. Using an FTP program to examine the directory structure, I find that in wp-content/plugins/simple-press, I only have the following sub-folders: admin, forum, resources, sp-api, and sp-startup. In 4.51, there were a lot of others.
Should I just copy the old styles folder from my 4.5.1 backup, or would that be a mistake? Am I missing anything else important?