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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:
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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: (19.0.4)
Operating system and version: (Debian 4.9.0-11-amd64)
Apache or nginx version: (Apache version unknown)
PHP version: (eg, 7.4.11)
App version OnlyOffice: (6.1.0)
App version documentserver_community: (0.1.8)
Nextcloud is installed on a shared hoster (at least with ssh access)
The issue you are facing:
After Update, it seems the documentserver can’t be reached either from nextcloud app or from desktop version of onlyoffice. A similar issue has been posted recently in german at https://help.nextcloud.com/t/update-auf-onlyoffice-documentserver-0-1-8-unerreichbarkeit/96107
Is this the first time you’ve seen this error? (Y/N):
Y
Steps to replicate it:
- Existing OnlyOffice and documentserver_community are installed and and working
- Update from NC18.0.7 to 19.0.4
- Update available apps
- Open a xlsx-file inside nextcloud
-> error message (translated from german): only office is not accesible at the moment. Contact your administrator
-> Same happens if trying to load the same file in the desktop version of OnlyOffice
The output of your Nextcloud log in Admin > Logging:
(App:index)
Exception: trim() expects parameter 1 to be string, bool given
/home/www/cloud/lib/private/AppFramework/App.php - line 137:
OC\AppFramework\Http\Dispatcher->dispatch(OCA\Document ... {}, "webApps")
/home/www/cloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47:
OC\AppFramework\App::main("OCA\\Docume ... r", "webApps", OC\AppFramew ... {}, { path: "app ... "})
<<closure>>
OC\AppFramework\Routing\RouteActionHandler->__invoke({ path: "app ... "})
/home/www/cloud/lib/private/Route/Router.php - line 297:
call_user_func(OC\AppFramew ... {}, { path: "app ... "})
/home/www/cloud/lib/base.php - line 1011:
OC\Route\Router->match("/apps/docum ... s")
/home/www/cloud/index.php - line 37:
OC::handleRequest()
Caused by TypeError: trim() expects parameter 1 to be string, bool given
/home/www/cloud/apps/documentserver_community/lib/SetupCheck.php - line 80:
trim(false)
/home/www/cloud/apps/documentserver_community/lib/SetupCheck.php - line 55:
OCA\DocumentServer\SetupCheck->lddError()
/home/www/cloud/apps/documentserver_community/lib/Controller/StaticController.php - line 90:
OCA\DocumentServer\SetupCheck->getHint()
/home/www/cloud/lib/private/AppFramework/Http/Dispatcher.php - line 170:
OCA\DocumentServer\Controller\StaticController->webApps("apps/api/documents/api.js")
/home/www/cloud/lib/private/AppFramework/Http/Dispatcher.php - line 100:
OC\AppFramework\Http\Dispatcher->executeController(OCA\Document ... {}, "webApps")
/home/www/cloud/lib/private/AppFramework/App.php - line 137:
OC\AppFramework\Http\Dispatcher->dispatch(OCA\Document ... {}, "webApps")
/home/www/cloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47:
OC\AppFramework\App::main("OCA\\Docume ... r", "webApps", OC\AppFramew ... {}, { path: "app ... "})
<<closure>>
OC\AppFramework\Routing\RouteActionHandler->__invoke({ path: "app ... "})
/home/www/cloud/lib/private/Route/Router.php - line 297:
call_user_func(OC\AppFramew ... {}, { path: "app ... "})
/home/www/cloud/lib/base.php - line 1011:
OC\Route\Router->match("/apps/docum ... s")
/home/www/cloud/index.php - line 37:
OC::handleRequest()
(App: documentserver_community)
OCA\DocumentServer\Document\DocumentConversionException: ./x2t: error while loading shared libraries: libgraphics.so: cannot open shared object file: No such file or directory
/home/www/cloud/apps/documentserver_community/lib/Document/ConverterBinary.php - line 72:
OCA\DocumentServer\Document\ConverterBinary->run("")
/home/www/cloud/apps/documentserver_community/lib/SetupCheck.php - line 34:
OCA\DocumentServer\Document\ConverterBinary->test()
/home/www/cloud/apps/documentserver_community/lib/Controller/StaticController.php - line 89:
OCA\DocumentServer\SetupCheck->check()
/home/www/cloud/lib/private/AppFramework/Http/Dispatcher.php - line 170:
OCA\DocumentServer\Controller\StaticController->webApps("apps/api/documents/api.js")
/home/www/cloud/lib/private/AppFramework/Http/Dispatcher.php - line 100:
OC\AppFramework\Http\Dispatcher->executeController(OCA\Document ... {}, "webApps")
/home/www/cloud/lib/private/AppFramework/App.php - line 137:
OC\AppFramework\Http\Dispatcher->dispatch(OCA\Document ... {}, "webApps")
/home/www/cloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47:
OC\AppFramework\App::main("OCA\\Docume ... r", "webApps", OC\AppFramew ... {}, { path: "app ... "})
<<closure>>
OC\AppFramework\Routing\RouteActionHandler->__invoke({ path: "app ... "})
/home/www/cloud/lib/private/Route/Router.php - line 297:
call_user_func(OC\AppFramew ... {}, { path: "app ... "})
/home/www/cloud/lib/base.php - line 1011:
OC\Route\Router->match("/apps/docum ... s")
/home/www/cloud/index.php - line 37:
OC::handleRequest()
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'debug' => true,
'instanceid' => 'xxxxxxx',
'passwordsalt' => 'xxxxxxx',
'secret' => 'xxxxxxx',
'trusted_domains' =>
array (
0 => 'cloud.domain.de',
),
'datadirectory' => '/home/www//cloud/data',
'overwrite.cli.url' => 'https://cloud.domain.de',
'dbtype' => 'mysql',
'version' => '19.0.4.2',
'dbname' => 'xxxxxxx',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'dbuser' => 'xxxxxxx',
'dbpassword' => 'xxxxxxx',
'logtimezone' => 'UTC',
'installed' => true,
'theme' => '',
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_from_address' => 'cloud',
'mail_domain' => 'domain.de',
'loglevel' => 2,
'trashbin_retention_obligation' => 'auto,14',
'versions_retention_obligation' => 'auto,7',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
'mail_smtpauth' => 1,
'mail_sendmailmode' => 'smtp',
'app_install_overwrite' =>
array (
0 => 'calendar',
),
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => mail.domain.de',
'mail_smtpport' => '465',
'mail_smtpname' => 'xxxxxxx',
'mail_smtppassword' => 'xxxxxxx',
'mail_smtpsecure' => 'ssl',
);
The output of your Apache/nginx/system log in /var/log/____:
not available (webhoster)