Nextcloud 12 Internal Server Errors after Login

When I upgraded from owncloud 9 to Nextcloud 11, my web interface was broken and I could not login to Nextcloud with the web interface. I was able to sync files to the server. I then upgraded to Nextcloud 12 through the command line interface. I still could not login to the web interface. The cause of the problem was that I moved the location of the webserver files from /var/www/owncloud to /var/www/nextcloud. I made the appropriate changes to my apache “sites-enabled” configuration file to redirect to the new location at /var/www/nextcloud. I was receiving “Internal Server” errors and the web interface was broken and unusable. I fixed the problem by following this thread https://help.nextcloud.com/t/solved-nc12-internal-server-error-after-login/13256 on deleting the data the in the database table oc_filecache. My steps were to:

1. stop the apache2 webserver
2. delete everything in “oc_filecache”
3. restart the webserver

I used phpmyadmin to remove the contents from “oc_filecache”. I think “oc_filecache” contained information pointing to the old location of my files in the owncloud directory instead of the new nextcloud directory. Below are the steps to delete the information in “oc_filecache”.

1. Login to phpmyadmin.
2. Select your “nextcloud” database. Your database may have a different name that “nextcloud”
3. Select the table “oc_filecache” listed on the far left of the page
4. Select “Operations” from the tab at the top of the page.
5. Select “Empty the table (TRUNCATE)”
6. Select “Ok” to confirm you will be deleting the data in “oc_filecache”.
7. Finished.