Getting ERRORS while accessing FLOW

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Nextcloud version: 19.0.5
Operating system and version: Centos 7.8
Apache or nginx version: Apache/2.4
PHP version: 7.4
MariaDB: 10.3

The issue I am facing:
In time I’m accessing as user admin the APP Flow in Settings under the Administration I get following Errors. …under Personal it seems to work.

Error	jsresourceloader	Could not find resource core/js/systemtags/systemtagscollection.js to load	
2021-01-05T12:47:56+0100
Error	jsresourceloader	Could not find resource core/js/systemtags/systemtagmodel.js to load	
2021-01-05T12:47:56+0100
Error	jsresourceloader	Could not find resource core/js/systemtags/systemtags.js to load	
2021-01-05T12:47:56+0100
Error	jsresourceloader	Could not find resource core/js/oc-backbone-webdav.js to load	
2021-01-05T12:47:56+0100

Is this the first time you’ve seen this error? (Y/N): N
But after upgrade to NC 20 it’s still there

Steps to replicate it:

accessing as user admin the APP Flow in Settings under the Administration

  1. NC Logon as admin
  2. open Settings
  3. goto Administration
  4. start the app Flow
  5. check the Logging

The output of your Nextcloud log in Admin > Logging:

{"reqId":"SEEMS-TO-BE-A-SECRET","level":3,"time":"2021-01-05T11:40:33+00:00","remoteAddr":"1111:222:333:4444:5555:6666:7777:8888","user":"user","app":"jsresourceloader","method":"GET","url":"/nextcloud/index.php/settings/admin/workflow","message":"Could not find resource core/js/oc-backbone-webdav.js to load","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0","version":"20.0.4.0"}
{"reqId":"SEEMS-TO-BE-A-SECRET","level":3,"time":"2021-01-05T11:40:33+00:00","remoteAddr":"1111:222:333:4444:5555:6666:7777:8888","user":"user","app":"jsresourceloader","method":"GET","url":"/nextcloud/index.php/settings/admin/workflow","message":"Could not find resource core/js/systemtags/systemtags.js to load","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0","version":"20.0.4.0"}
{"reqId":"SEEMS-TO-BE-A-SECRET","level":3,"time":"2021-01-05T11:40:33+00:00","remoteAddr":"1111:222:333:4444:5555:6666:7777:8888","user":"user","app":"jsresourceloader","method":"GET","url":"/nextcloud/index.php/settings/admin/workflow","message":"Could not find resource core/js/systemtags/systemtagmodel.js to load","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0","version":"20.0.4.0"}
{"reqId":"SEEMS-TO-BE-A-SECRET","level":3,"time":"2021-01-05T11:40:33+00:00","remoteAddr":"1111:222:333:4444:5555:6666:7777:8888","user":"user","app":"jsresourceloader","method":"GET","url":"/nextcloud/index.php/settings/admin/workflow","message":"Could not find resource core/js/systemtags/systemtagscollection.js to load","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0","version":"20.0.4.0"}

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

<?php
$CONFIG = array (
  'instanceid' => 'abcdefghij',
  'passwordsalt' => 'ITSSOSECRET',
  'secret' => 'ITSANOTHERSECRET',
  'trusted_domains' => 
  array (
    0 => 'domain.org',
  ),
  'datadirectory' => '/var/www/virtual/user/nextcloud_data',
  'dbtype' => 'mysql',
  'version' => '20.0.4.0',
  'overwrite.cli.url' => 'https://domain.org/nextcloud',
  'dbname' => 'DB_user_nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'DB_user',
  'dbpassword' => 'SECRET',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'theme' => '',
  'loglevel' => 2,
  'maintenance' => false,
  'mail_from_address' => 'mailuser',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => 'domain.org',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_smtphost' => 'mail.domain.org',
  'mail_smtpport' => '587',
  'mail_smtpname' => 'smtp_name',
  'mail_smtppassword' => 'mail_secret',
  'app_install_overwrite' => 
  array (
    0 => 'files_external',
  ),
  'data-fingerprint' => 'a2a2a2a2a2a2a2a2a2a2a2a2a2a2a2a',
  'updater.secret' => '!w34!"WD4!ED&%5665trzdftre4w43"§$"54e%RE$%',
  'encryption.legacy_format_support' => false,
  'encryption.key_storage_migrated' => false,
);

Is there any I can do?
In other words, what does it mean and have I to do anything here.
What is not working?

May it relay on statement in config.php I do not understand what fore it is?

array (
    0 => 'files_external',
  ),