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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 14.0.1.1
Operating system and version (eg, Ubuntu 17.04): Raspbian Stretch
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.1): 7.0.30
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
Es ist nicht möglich den Netzwerkornder hinzuzufügen, ich habe es nach der Nextcloud Anleitung probiert, erhalte aber immer nur die Fehlermeldung “Dieser Netzwerkordner ist zurzeit unter Verwendung eines anderen Namens und Kennwortes verbunden.
Trennen Sie zuerst jede bestehenede Verbindung auf diese Netzwerfreigabe, um unter Verwendung eines anderen Namens und Kennwortes verbunden zu werden.”
Ich verwenden den URL “http://example.com/remote.php/dav/files/USERNAME/”
Ich habe das Verzeichnis für die Benutzer auf eine Exteren Festplatte gespeichert, kann es damit zusammen hängen?
The output of your Nextcloud log in Admin > Logging:
Empty
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '',
'passwordsalt' => 'i',
'secret' => '',
'trusted_domains' =>
array (
0 => '192.168.178.39',
1 => '',
2 => '',
),
'datadirectory' => '/media/usb-hdd/nextcloud/data',
'dbtype' => 'mysql',
'version' => '14.0.1.1',
'overwrite.cli.url' => '',
'dbname' => 'owncloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => '',
'dbpassword' => '',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'maintenance' => false,
'filelocking.enabled' => true,
'default_language' => 'de',
'log_type' => 'file',
'logfile' => '/media/usb-hdd/nextcloud/nextcloud.log',
'preview_libreoffice_path' => '/usr/bin/libreoffice',
'enabledPreviewProviders' => array(
'OC\Preview\PNG',
'OC\Preview\JPEG',
'OC\Preview\GIF',
'OC\Preview\HEIC',
'OC\Preview\BMP',
'OC\Preview\XBitmap',
'OC\Preview\MP3',
'OC\Preview\TXT',
'OC\Preview\MarkDown'
),
);
The output of your Apache/nginx/system log in /var/log/____:
Empty
