Internal Server Error on Snap / Ubuntu 20.04

I enabled a apps including External Storage backend for Dropbox ( After enabling the app I get a Internal Server Error when logging in from the web browser. I did not configure the app and I would like to disable the app to resume a working installation.

I think this is the relevant part of /var/snap/nextcloud/common/nextcloud/data/nextcloud.log.

"Exception": "Doctrine\\DBAL\\Exception\\TableNotFoundException",
        "Message": "An exception occurred while executing 'SELECT `m`.`mount_id`, `mount_point`, `storage_backend`, `auth_backend`, `priority`, `m`.`type` FROM `oc_external_mounts` `m` INNER JOIN `oc_external_applicable` `a` ON `m`.`mount_id` = `a`.`mount_id` WHERE ((`a`.`type` = ?) AND (`a`.`value` IS NULL)) OR ((`a`.`type` = ?) AND (`a`.`value` = ?)) OR ((`a`.`type` = ?) AND (`a`.`value` IN (?, ?, ?)))' with params [1, 3, \"jimmy\", 2, \"Basic\", \"Executive\", \"admin\"]:\n\nSQLSTATE[42S02]: Base table or view not found: 1146 Table 'nextcloud.oc_external_mounts' doesn't exist",
        "Code": 0,
        "Trace": [

Fixed with sudo nextcloud.occ app:disable files_external