Error AH01797 with Nextcloud 18, Apache2.4 and PHP 7.2

we have Nextcloud running on Ubuntu 18.04 with apache2.4 and php7.2
Poorly we are facing errors when using the iPhone-App.
Even extensive googling didnt help me with this :confused:

Heres the Error shown in the App

Apache says

[Tue Feb 11 13:00:23.355328 2020] [access_compat:error] [pid 8580] [client SOMEIP:40640] AH01797: client denied by server configuration: /var/www/nextcloud/config

Nextcloud-Log says

{"reqId":"SomeRandomCharachters","level":2,"time":"2020-02-11T13:02:58+00:00","remoteAddr":"SOMEIP","user":"--","app":"core","method":"PROPFIND","url":"/remote.php/webdav","message":"Login failed: 'SOMEGUID' (Remote IP: 'SOMEIP')","userAgent":"Mozilla/5.0 (iOS) Nextcloud-iOS/2.25.6","version":""}

Heres my config:
And the Apache-Site

Any Help is appreciated.

I solved the same problem today by removing the file from the All Files folder via Browser.

Hope it helps.

Mihai M.