Im on 18.0.1 everything working fine. So I decided to try something experimental which was a mistake. I installed e2e encryption and dropbox connection.
This kicked me out of nextcloud.
sudo -u www-data php occ app:disable end_to_end_encryption (or files_external_dropbox)
is giving me both the same error:
PHP Fatal error: Interface 'OCA\Files_External\Lib\Config\IBackendProvider' not found in /var/www/netcloud/apps/files_external_dropbox/lib/AppInfo/Application.php on line 31
ls dltr apps/*
is showing both so what am I missing.