Error while configuring the plugin

[CSCSxx]

I just set up a new system using a Sameersbn Redmine Docker Image.
Special features: Different editors, project-dependent use (via plugin)
The CK Editor itself seems to be working, I was able to successfully create tickets.
However, trying to configure the editor under Administration->Plugins fails.

System Info:
Redmine version 4.2.3.stable
Ruby version 2.6.6-p146 (2020-03-31) [x86_64-linux-gnu]
Rails version 5.2.6
Environment production
Database adapter Mysql2
Mailer queue ActiveJob::QueueAdapters::AsyncAdapter
Mailer delivery smtp
SCM:
Subversion 1.13.0
Mercurial 5.3.1
Cvs 1.12.13
Bazaar 3.0.2
Git 2.33.1
Filesystem
Redmine plugins:
additionals 3.0.5-master
redmine_agile 1.6.2
redmine_checklists 3.1.20
redmine_ckeditor 1.2.3
redmine_cms 1.2.2
redmine_contacts 4.3.4
redmine_contacts_helpdesk 4.1.12
redmine_dmsf 2.4.11
redmine_drive 1.1.1
redmine_people 1.6.1
redmine_per_project_formatting 0.1.0
redmine_questions 1.0.2
redmine_reporter 2.0.1
redmine_resources 1.0.6
redmine_wktime 4.4.1
redmine_wysiwyg_editor 0.23.0
redmine_zenedit 2.0.2
redmineup_tags 2.0.11
vault 0.4.3

Error Message:
Started GET "/settings/plugin/redmine_ckeditor" for 127.0.0.1 at 2022-01-28 12:00:44 +0000
Processing by SettingsController#plugin as HTML
Parameters: {"id"=>"redmine_ckeditor"}
Current user: admin (id=1)
Rendering settings/plugin.html.erb within layouts/admin
Rendered plugins/redmine_ckeditor/app/views/settings/_ckeditor.html.erb (1561.4ms)
Rendered settings/plugin.html.erb within layouts/admin (1564.5ms)
Completed 500 Internal Server Error in 1948ms (ActiveRecord: 151.0ms)

ActionView::Template::Error (undefined local variable or method `ckeditor_javascripts' for #<#Class:0x00007f3eb0998360:0x00007f3eb0d5f4f8>):
1: <%= ckeditor_javascripts %>
2: <%= stylesheet_link_tag 'editor', :plugin => 'redmine_ckeditor'%>
3: <%= stylesheet_link_tag 'selector', :plugin => 'redmine_ckeditor'%>
4:

plugins/redmine_ckeditor/app/views/settings/_ckeditor.html.erb:1:in _plugins_redmine_ckeditor_app_views_settings__ckeditor_html_erb__282186640417499865_69953594841420' app/views/settings/plugin.html.erb:6:in block in _app_views_settings_plugin_html_erb__3354318643736265320_69953613775960'
app/views/settings/plugin.html.erb:4:in _app_views_settings_plugin_html_erb__3354318643736265320_69953613775960' plugins/redmine_per_project_formatting/lib/redmine_per_project_formatting/application_controller_patch.rb:24:in block in change_text_formatting'
plugins/redmine_per_project_formatting/lib/redmine_per_project_formatting/setting_patch.rb:19:in within_text_formatting' plugins/redmine_per_project_formatting/lib/redmine_per_project_formatting/application_controller_patch.rb:23:in change_text_formatting'
lib/redmine/sudo_mode.rb:61:in sudo_mode' plugins/redmine_dmsf/lib/redmine_dmsf/webdav/custom_middleware.rb:56:in call'

[DeaconF]

Had the same problem, this quickfix worked for me:
ba7d8b5

[CSCSxx]

Cool, works also for me!
Thank you :)

Should urgently be migrated to the current version!

[JonYeb]

Worked for me, had the same issue before. Thanks.