Sharing settings page blank; normal and admin user

[/details]

Nextcloud version 14.0.6
Operating system and version Debian 9.6
Apache or nginx version Apache 2.4.25
PHP version 7.0.33

The issue you are facing:

Cannot see the settings for “sharing” as normal and admin user

Is this the first time you’ve seen this error? Y/N

Steps to replicate it:

  1. Go to settings
  2. press Sharing
  3. blank page will show

The output of your Nextcloud log in Admin > Logging:

Error PHP Undefined index: /folder/Test/Neuer Ordner at /var/www/cloud/apps/files_versions/lib/Storage.php#245 January 31, 2019 12:07:33
Error no app in context OC\User\NoUserException: Attempted to initialize mount points for null user and no user in session January 31, 2019 12:07:32
Warning core Login failed: ‘admin’ (Remote IP: ‘x.x.x’) January 30, 2019 19:29:39
Error core OC\HintException: Memcache \OC\Memcache\APCu not available for local cache January 30, 2019 18:28:28
Error core OC\HintException: Memcache \OC\Memcache\APCu not available for local cache January 30, 2019 18:28:28
Error index OC\HintException: Memcache \OC\Memcache\APCu not available for local cache January 30, 2019 18:28:28
Error index OC\HintException: Memcache \OC\Memcache\APCu not available for local cache January 30, 2019 18:28:28
Error core OC\HintException: Memcache \OC\Memcache\APCu not available for local cache January 30, 2019 18:28:28
Error core OC\HintException: Memcache \OC\Memcache\APCu not available for local cache

I fixed already the APCu errors they were yesterday

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' =>
  array (
    0 => 'x.y.z',
  ),
  'datadirectory' => '/var/www/cloud/data',
  'overwrite.cli.url' => 'http://x.y.z',
  'dbtype' => 'mysql',
  'version' => '14.0.6.0',
  'dbname' => 'user',
  'dbhost' => 'host',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'cloud',
  'dbpassword' => 'pass',
  'installed' => true,
  'ldapIgnoreNamingRules' => false,
  'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
  'allow_user_to_change_display_name' => false,
  'auth.bruteforce.protection.enabled' => true,
  'mail_domain' => 'y.z',
  'mail_from_address' => 'cloud',
  'mail_smtpdebug' => false,
  'mail_smtpmode' => 'smtp',
  'mail_smtphost' => 'x.x.x.x',
  'mail_smtpport' => '25',
  'mail_smtptimeout' => 10,
  'trashbin_retention_obligation' => 'auto',
  'versions_retention_obligation' => 'auto',
  'has_internet_connection' => true,
  'check_for_working_webdav' => true,
  'check_for_working_wellknown_setup' => true,
  'check_for_working_htaccess' => true,
  'check_data_directory_permissions' => true,
  'log_type' => 'file',
  'logfile' => '/var/log/cloud.log',
  'loglevel' => 2,
  'logdateformat' => 'F d, Y H:i:s',
  'logtimezone' => 'x',
  'log_query' => false,
  'cron_log' => true,
  'enable_avatars' => true,
  'mail_smtpauthtype' => 'LOGIN',
  'maintenance' => false,
  'theme' => '',
  'skeletondirectory' => '',
  'lost_password_link' => 'disabled',
  'updatechecker' => true,
  'enable_previews' => true,
  'ldapUserCleanupInterval' => 51,
  'memcache.local' => '\OC\Memcache\APCu',
);

The output of your Apache/nginx/system log in `/var/log/____`:

x.x.x.x - - [31/Jan/2019:12:50:27 +0100] "GET /index.php/settings/user/sharing HTTP/1.1" 200 7198 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
[Thu Jan 31 12:50:27.922651 2019] [authz_core:error] [pid 25593] [client x.x.x.x:55651] AH01630: client denied by server configuration: /var/www/cloud/data/.ocdata
x.x.x.x - - [31/Jan/2019:12:50:27 +0100] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 1331 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
x.x.x.x - - [31/Jan/2019:12:50:27 +0100] "PROPFIND /remote.php/webdav HTTP/1.1" 207 2568 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
x.x.x.x - - [31/Jan/2019:12:50:27 +0100] "GET /data/.ocdata?t=1548935427910 HTTP/1.1" 302 1198 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
x.x.x.x - - [31/Jan/2019:12:50:27 +0100] "GET /index.php/heartbeat HTTP/1.1" 200 1130 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
x.x.x.x - - [31/Jan/2019:12:50:28 +0100] "GET /index.php/apps/files/ HTTP/1.1" 200 9386 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
x.x.x.x - - [31/Jan/2019:12:50:27 +0100] "GET /index.php/settings/ajax/checksetup HTTP/1.1" 200 2740 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"

Issue resolved,

the first option at “Federated-Cloud-Sharing” was disabled