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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
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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 (eg, 18.0.2): 19.0.4
Operating system and version (eg, Ubuntu 20.04): Raspberry Pi OS (32-bit) 2020-08-20
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.38
PHP version (eg, 7.1): 7.4.12
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
The output of your Nextcloud log in Admin > Logging:
{"reqId":"UElqRD4KjNBphpYbmB6c","level":3,"time":"2020-11-06T22:44:48+00:00","remoteAddr":"::1","user":"Administrator","app":"PHP","method":"GET","url":"/apps/files/","message":{"Exception":"Error","Message":"Undefined offset: 3 at /media/pi/Seagate/chmura/lib/private/legacy/OC_Helper.php#548","Code":0,"Trace":[{"file":"/media/pi/Seagate/chmura/lib/private/legacy/OC_Helper.php","line":548,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"file":"/media/pi/Seagate/chmura/apps/files/lib/Controller/ViewController.php","line":139,"function":"getStorageInfo","class":"OC_Helper","type":"::"},{"file":"/media/pi/Seagate/chmura/apps/files/lib/Controller/ViewController.php","line":187,"function":"getStorageInfo","class":"OCA\\Files\\Controller\\ViewController","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/Http/Dispatcher.php","line":169,"function":"index","class":"OCA\\Files\\Controller\\ViewController","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/Http/Dispatcher.php","line":100,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/App.php","line":152,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/Route/Router.php","line":308,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/media/pi/Seagate/chmura/lib/base.php","line":1009,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/media/pi/Seagate/chmura/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/media/pi/Seagate/chmura/lib/private/Log/ErrorHandler.php","Line":91,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36","version":"20.0.1.1"}
{"reqId":"cFPpbPqd0A7e9RkA0Ews","level":3,"time":"2020-11-06T22:44:52+00:00","remoteAddr":"::1","user":"Administrator","app":"PHP","method":"GET","url":"/index.php/apps/files/ajax/getstoragestats.php?dir=%2F","message":{"Exception":"Error","Message":"Undefined offset: 3 at /media/pi/Seagate/chmura/lib/private/legacy/OC_Helper.php#548","Code":0,"Trace":[{"file":"/media/pi/Seagate/chmura/lib/private/legacy/OC_Helper.php","line":548,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"file":"/media/pi/Seagate/chmura/apps/files/lib/Helper.php","line":51,"function":"getStorageInfo","class":"OC_Helper","type":"::"},{"file":"/media/pi/Seagate/chmura/apps/files/lib/Controller/AjaxController.php","line":47,"function":"buildFileStorageStatistics","class":"OCA\\Files\\Helper","type":"::"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/Http/Dispatcher.php","line":169,"function":"getStorageStats","class":"OCA\\Files\\Controller\\AjaxController","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/Http/Dispatcher.php","line":100,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/App.php","line":152,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/Route/Router.php","line":308,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/media/pi/Seagate/chmura/lib/base.php","line":1009,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/media/pi/Seagate/chmura/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/media/pi/Seagate/chmura/lib/private/Log/ErrorHandler.php","Line":91,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36","version":"20.0.1.1"}
{"reqId":"bYWckjH3C5OmIrJdiuGm","level":3,"time":"2020-11-06T22:44:54+00:00","remoteAddr":"::1","user":"Administrator","app":"PHP","method":"GET","url":"/index.php/apps/files/ajax/getstoragestats.php?dir=%2FPliki","message":{"Exception":"Error","Message":"Undefined offset: 3 at /media/pi/Seagate/chmura/lib/private/legacy/OC_Helper.php#548","Code":0,"Trace":[{"file":"/media/pi/Seagate/chmura/lib/private/legacy/OC_Helper.php","line":548,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"file":"/media/pi/Seagate/chmura/apps/files/lib/Helper.php","line":51,"function":"getStorageInfo","class":"OC_Helper","type":"::"},{"file":"/media/pi/Seagate/chmura/apps/files/lib/Controller/AjaxController.php","line":47,"function":"buildFileStorageStatistics","class":"OCA\\Files\\Helper","type":"::"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/Http/Dispatcher.php","line":169,"function":"getStorageStats","class":"OCA\\Files\\Controller\\AjaxController","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/Http/Dispatcher.php","line":100,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/AppFramework/App.php","line":152,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/media/pi/Seagate/chmura/lib/private/Route/Router.php","line":308,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/media/pi/Seagate/chmura/lib/base.php","line":1009,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/media/pi/Seagate/chmura/index.php","line":37,"function":"handleRequest","class":"OC","type":"::"}],"File":"/media/pi/Seagate/chmura/lib/private/Log/ErrorHandler.php","Line":91,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36","version":"20.0.1.1"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'octblraayt15',
'passwordsalt' => ***',
'secret' => ***',
'trusted_domains' =>
array (
0 => '***',
1 => '***',
),
'datadirectory' => '/media/pi/Seagate/data',
'dbtype' => 'mysql',
'version' => '19.0.4.2',
'overwrite.cli.url' => '***',
'dbname' => 'chmura',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '***',
'dbpassword' => '***',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'default_language' => 'pl',
'default_locale' => 'pl',
'auth.webauthn.enabled' => false,
'overwriteprotocol' => 'https',
'htaccess.RewriteBase' => '/',
'simpleSignUpLink.shown' => false,
'maintenance' => false,
'updater.release.channel' => 'stable',
'mail_from_address' => 'chmura',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => '***',
'mail_smtptimeout' => 30,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.zoho.eu',
'mail_smtpsecure' => 'tls',
'mail_smtpport' => '587',
'mail_smtpname' => '***',
'mail_smtppassword' => '***',
'integrity.check.disabled' => true,
'app_install_overwrite' =>
array (
0 => 'maps',
1 => 'admin_notifications',
),
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\BMP',
4 => 'OC\\Preview\\XBitmap',
5 => 'OC\\Preview\\Movie',
6 => 'OC\\Preview\\MP3',
7 => 'OC\\Preview\\TXT',
8 => 'OC\\Preview\\MarkDown',
),
'filesystem_check_changes' => 1,
);
The output of your Apache/nginx/system log in /var/log/____:
---
I am getting this error when I’m selecting files, folder or folders to move/delete/copy/etc. Has anyone experienced the same problem? I have no idea what could be causing the problem, no files are locked, everything is fine. Please help 
