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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:
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 : 16.0.1
Operating system and version : Debian 8.11
Apache or nginx version : Apache/2.4.10 (Debian)
PHP version : PHP 7.2.14-1+0
The issue you are facing:
When trying to share a folder or group, I see only a list of 2 users and 1 group I can share with (its more 47 users and15 groups...but those are not displayed) When trying to type in existing username, An error is displayed at the very top: nvalid query, please check the syntax. API specifications are here: http://www.freedesktop.org/wiki/Specifications/open-collaboration-services sharing
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
-
Upload file -
press share button -
try typing in a username to share with
The output of your Nextcloud log in Admin > Logging:
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
more config.php
<?php
$CONFIG = array (
'instanceid' => 'i',
'passwordsalt' => '',
'secret' => '',
'trusted_domains' =>
array (
0 => 'attac-intern2.kunden.heinlein-hosting.de',
1 => 'cloud.attac.de',
2 => 'cloud2.attac.de',
),
'datadirectory' => '/var/www/data',
'overwrite.cli.url' => 'http://cloud2.attac.de',
'dbtype' => 'mysql',
'version' => '16.0.1.1',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_admin',
'dbpassword' => 'J',
'logtimezone' => 'UTC',
'installed' => true,
'maintenance' => false,
'mysql.utf8mb4' => true,
'theme' => '',
'loglevel' => 2,
'updater.release.channel' => 'stable',
'trashbin_retention_obligation' => 1,
0 => 3,
'mail_from_address' => 'nextcloud',
'mail_smtpmode' => 'smtp',
'mail_smtpauth' => 1,
'mail_sendmailmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_domain' => ',
'mail_smtpauthtype' => 'PLAIN',
'mail_smtphost' =>
'mail_smtpport' => '25',
'mail_smtpname' =>
'mail_smtppassword'
'app_install_overwrite' =>
array (
0 => 'calendar',
),
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
