Steps to reproduce

1. Generate Magnolia DX web app with archetype
2. Install livecopy module
3. Enable i18n for livecopy authoring by setting /config/server/i18n/authoring@class property to info.magnolia.livecopy.i18n.LiveCopyMultiSiteI18nAuthoringSupport
4. Restart the instance
5. Login and access feeds app

Expected results

App is open correctly

Actual results

An error occurs [^error.txt]

Workaround

Development notes

Very same test with demo bundle doesn't produce the error. Classpath of both installations have been reviewed. [^libs.txt] [^libs-demo.txt]
Noticeable differences (among other):

• Content editor and block API in demo bundle are 2.1.6 whereas in archetype-generated war are 1.3.14
• Demo bundle contains magnolia-content-tags-integration
• Demo bundle contains magnolia-pages-content-tags-integration libraries
  None of this libraries seem to be related with the error though.